An MOX batch sintering furnace synchronous lifting device comprises a synchronous lifting device, a synchronous circuit and a furnace bottom raising device. The furnace bottom raising device comprises a lifting motor 6, a furnace bottom cover 8, a lead screw 9 and a furnace body 10. The lifting motor 6 drives the lead screw 9 to rotate. The lead screw 9 enables the furnace bottom cover 8 to rise so as to be close to the furnace body 10. The synchronous lifting device comprises a threaded lead screw 1, a guide rod 2, a synchronous motor 3, a simulation sintering furnace bottom 4 and a laser ranging sensor 5. The synchronous motor 3 drives the threaded lead screw 1 to rotate, so that the simulation sintering furnace bottom 4 on the threaded lead screw 1 and the guide rod 2 are made to rise. Besides, the laser ranging sensor 5 is installed on the simulation sintering furnace bottom 4. In a synchronous circuit, the lifting motor 6 and the synchronous motor 3 are both connected with a signal detection and control circuit 7, the control circuit 7 can reduce the rotation speed of the lifting motor 6 and then transmits the rotation speed electrical signal to the synchronous motor 3, and therefore the lifting motor 6 and the synchronous motor 3 can synchronously conduct ascending and descending. The distance or lifting height of the furnace bottom cover 8 can be judged.