The invention relates to the motor detection technology field and particularly relates to a ventilation door motor detection system. The ventilation door motor detection system is characterized in that a main control circuit board is provided with a power source processing module, a single-chip microcomputer embedded with processing software, an RS232 interface, a blower driving module, an encoderacquisition module, an angle sensor acquisition module, a servo motor driving module and a stepping motor driving module, wherein the RS232 interface is connected with a man-machine interaction interface HMI, the encoder acquisition module is connected with a photoelectric encoder, and an output end of the stepping motor driving module or an output end of the servo motor driving module is connected with an input end of a to-be-detected ventilation door motor of a to-be-detected member. Compared with the prior art, air-conditioner ventilation door motors employing stepping motors or servo motors can be compatibly tested, and test precision of rotation angles of the ventilation door motors can be improved.