The invention relates to an automatic transmission device for reshipping a quartz boat, solving the problems that the traditional manual operation has poor reliability and low efficiency, the existing transmission device is constrained by the structure to affect the moving range, and the like. The automatic transmission device comprises a frame, a lifting arm, a gripper mechanism and an electric control device and is characterized in that the lifting arm is connected with an active rotating arm and a passive rotating arm on the lifting arm to be with the gripper mechanism to form a four-link adjusting mechanism. The active rotating arm on the lifting arm is fixed on a transmission shaft driven by an arm rotating motor, and the telescopic arm of the active rotating arm is hinged at one endof the gripper mechanism. The passive rotating arm on the lifting arm is fixed on a driven shaft, and the other end is hinged on the gripper mechanism. The automatic transmission device has the advantages of reasonable design, simple transmission structure, wide moving range, fast and accurate transmission positioning control, easy installation, convenient debugging and maintenance, significant increase in carrying capacity and safe and reliable operation, improving the operational efficiency of heat treatment equipment, and avoiding damage of silicon wafer and solar cells.