Hybrid electric drive assembly test method, device, system and medium

The invention discloses a hybrid electric drive assembly test method, device and system and a medium, and the method comprises the steps: controlling a low-voltage power supply to provide low voltage for a to-be-tested hybrid electric drive assembly, and detecting whether the power of the low-voltage power supply is within a first power range; if the power of the low-voltage power source is within the first power range, a target test program is written into the hybrid electric drive assembly through the target tool, the high-voltage power source is controlled to provide high voltage for the hybrid electric drive assembly, and whether the power of the high-voltage power source is within the second power range or not is detected; the voltage of the low-voltage electricity is smaller than that of the high-voltage electricity; and if the power of the high-voltage power supply is within a second power range, configuring a target test environment and target test parameters for the hybrid electric drive assembly, an