Testing device and testing method of electric steering engine

The invention discloses a testing device and a testing method of an electric steering engine. The testing method is characterized in that a digital control instruction is sent and a digital feedback signal is received by an industrial control computer; communication protocol conversion is carried out upon the digital control instruction and the feedback signal by a test transfer box; when the electric steering engine to be tested is of analogue type, digital-to-analogue conversion is carried out upon the digital control instruction signal after communication protocol conversion to generate an analogue control instruction; analogue-to-digital conversion is carried out upon a feedback signal after communication protocol conversion to generate a digital feedback signal; the electric steering engine to be tested is controlled by an electric steering engine controller to drive a simulated load table to work according to the digital control instruction or the analogue control instruction, and a signal generated during work is sent to the test transfer box to be used as a feedback signal. According to the testing device and the testing method disclosed by the invention, the entire test device is commonly used in test of analogue and digital electric steering engines through functions of analogue-to-digital conversion and digital-to-analogue conversion of the test transfer box, so that the test process is simplified.