A precise controlled internal heating type electric furnace, characterized in that the precise controlled internal heating type electric furnace comprises a heat preserving cylinder body (14), and a top portion of the heat preserving cylinder body (14) is provided with a group of heat preserving furnace top doors (15) which can be opened and closed;
- the heat preserving furnace top doors (15) thereon are provided with a tank body sintering hanger self-rotating piece (16) which penetrates through the heat preserving furnace top doors;
- a bottom portion of the tank body sintering hanger self-rotating piece is further provided with a planar electric furnace (11), and a bottom surface of the planar electric furnace is provided with a group of electric heating elements;
- the precise controlled internal heating type electric furnace further comprises a main body heating electric furnace (7) in the heat preserving cylinder body (14);
- the main body heating electric furnace (7) sequentially comprises a ring body planar electric furnace (10), a multilayer regionally-combined cylindrical electric furnace (8) and a truncated-cone step-shaped electric furnace (9) from bottom to top;
- a ring body planar furnace lifting piece (17) is further provided below the ring body planar electric furnace (10);
- the ring body planar electric furnace (10) consists of a ring planar electric furnace (10a) and a straight ring body electric furnace (10b);
- a ring plane of the ring planar electric furnace (10a) thereon is provided with a plurality of turns of concentric circular grooves with different diameters;
- a group of electric heating elements (12.18) are wound in the concentric circular grooves;
- an inner circumferential wall of the straight ring body electric furnace (10b) is provided with a plurality of ring grooves from bottom to top;
- a group of electric heating elements (12.19) are wound in the ring grooves;
- the multilayer regionally-combined cylindrical electric furnace (8) is formed by stacking a plurality of layers of circular flat plates (8a) with the same diameter and central axes which are overlapped, outer circumferential walls of the circular flat plates are provided with ring grooves, and a group of electric heating elements (12.1-12.16) are wound in the ring grooves of every 2-8 layers;
- the truncated-cone step-shaped electric furnace (9) is formed by stacking a plurality of circular flat plates (9a) with different diameters and central axes which are overlapped, the diameters of the circular flat plates (9a) are successively decreased from bottom to top to form a step-shaped circular platform, a group of electric heating elements (12.17) are wound in every 2-8 layers of step-shaped platform surfaces, a seal-head-shaped heating structure component (9b) which is structurally fit and consistent with an inner wall of the seal head (3a2) of the inner cylinder body covers a periphery of the truncated-cone step-shaped electric furnace (9), and the seal-head-shaped heating structure component is made of heat-resistant steel;
- and all groups of electric heating elements in the precise controlled internal heating type electric furnace are respectively connected with a temperature control system.