The present invention relates to a servo unit safety function testing system and method and belongs to the safety testing field. The system includes a tested motor, an NI-cDAQ measurement and control unit, a tri-axial test platform and a test unit; the test signal output end of the test unit is connected with the test signal input end of the NI-cDAQ measurement and control unit; the test signal output end of the NI-cDAQ measurement and control unit is connected with the control signal input end of the tested motor; the control signal output end of the tested motor is connected with the control signal input end of the tri-axial test platform; a moving distance and a test operation process which are required by the tri-axial test platform in a test process are inputted; corresponding control instructions are generated according to the moving distance and test operation process which are required by the tri-axial test platform in the test process; and the movement of the tri-axial test platform is controlled according to the control instructions. The servo unit safety function testing system and method of the invention are applicable to the safety testing of the tested motor.