The utility model discloses a small and medium-sized photovoltaic grid-connected inverter single board automatic testing platform, which comprises an ADC module, an eCAN module, an EPWM module, a GPIO module, an SCI module, a signal generation module, a sampled signal processing module, a serial port communication module and a display module, wherein the ADC module is used for sampling a power supply value and a PWM amplitude value of a single board to be tested; the eCAN module is used for detecting whether the single board to be tested can be normally connected in CAN communication or not and whether the single board to be tested can correctly transmit sampled data or not; the EPWM module is used for detecting CAP square waves, the PWM wave frequency and the duty ratio of the single board to be tested; the GPIO module is used for detecting analog input, analog output and LED lamp control of the single board to be tested; the SCI module is used for displaying detected information on a PC (personal computer); the signal generation module is used for generating AC signals; the sampled signal processing module is used for processing data signals and sending the processed data signals into a digital signal processor; the serial port communication module is used for being communicated with the PC; and the display module is used for displaying the test data on a screen. The small and medium-sized photovoltaic grid-connected inverter single board automatic testing platform has the advantages that the test process is simple and easy to operate, the detection efficiency is high, and errors are not easy to occur; and the debugging efficiency is greatly improved, and the manual workload is reduced.