Portable insulated lunch box

A portable insulated lunch box, comprising:

• a box body (1) and a cover body (2) adapted to the box body (1);
• the cover body (2) defines a mounting cavity (4) passing vertically through the cover body (2), an upper opening of the mounting cavity (4) is arranged with a pressing member (5), and a plurality of locking members (6), that are transversely, elastically, and movably connected, are arranged in the mounting cavity (4);
• an outer end of each locking member (6) passes through a cavity wall of the mounting cavity (4), and an inner end of each locking member (6) is arranged with an internal push bevel (7) matched with a lower edge of the pressing member (5);
• an inner side wall of the box body (1) is arranged with a plurality of clamping grooves (8) each matched with the outer end of a corresponding locking member (6);
• a lower part of the mounting cavity (4) is arranged with a pressure relief member (9) that is vertically, elastically, and movably connected, and an exhaust gap (10) is defined between the pressure relief member (9) and a lower opening of the mounting cavity (4);
• a top of the pressure relief member (9) is attached to the pressing member (5), and a bottom of the pressure relief member (9) is arranged with a seal block (11) disposed on an outside of the cover body (2) and covering the lower opening of the mounting cavity (4).