A forced separation device for a submarine drilling machine and a drilling tool, comprising a transmission shaft, a main shaft, an electromagnetic transmission mechanism, a blasting separation mechanism and a pressure-resistant cabin, wherein a gland is fastened to the upper portion of the pressure-resistant cabin, the electromagnetic transmission mechanism is provided with a driving sucker and a driven sucker which are attracted with each other, the driving sucker is connected with the transmission shaft, the driven sucker is connected with the main shaft, the gland is welded with the transmission shaft, and the driven sucker is welded with the lower portion of the pressure-resistant cabin;
- the blasting separation mechanism is provided with a plurality of explosive packages and detonators, the explosive packages are distributed between the gland and the top surface of the pressure-resistant cabin, and each explosive package is connected with the corresponding detonator respectively;
- and the pressure-resistant cabin is further internally provided with a storage battery for supplying power to the electromagnetic transmission mechanism and the blasting separation mechanism.