The utility model belongs to the technical field of solar cell production. The utility model discloses an electric injection device. The electric injection device comprises a shell and an electric injection part, wherein the shell is internally provided with a process cavity, the electric injection part can be used for electrifying a silicon wafer accommodated in the process cavity so as to carryout electric injection operation on the silicon wafer and raise the temperature of the silicon wafer, and the process cavity is also internally provided with an auxiliary heating structure which is electrically connected with a standby power supply so as to heat the silicon wafer when the silicon wafer is electrified; and the temperature measuring assembly is used for measuring the temperature ofthe silicon wafer and is electrically connected with the standby power supply. According to the electric injection device provided by the utility model, the abnormal temperature drop of the silicon wafer can be measured through the temperature measuring assembly, and the temperature of the silicon wafer is maintained through the auxiliary heating structure powered by the stand-by power supply, sothat the silicon wafer in electric injection operation is prevented from influencing the electric injection effect and the productivity due to the abnormal temperature drop, and the silicon wafer is prevented from being scrapped.