Mainboard test system and method of intelligent terminal

The invention provides a mainboard test system and method of an intelligent terminal. The mainboard test system comprises a to-be-tested mainboard, power supply equipment, a control module and a protection circuit; a test voltage value is preset in the control module, and the control module sends a power supply instruction with the test voltage value to the power supply equipment; the power supply equipment provides a test voltage based on the test voltage value for the protection circuit, and the protection circuit provides the test voltage for the to-be-tested mainboard; the to-be-tested mainboard feeds back feedback voltage to the protection circuit according to different types, and the protection circuit sends a voltage value of the feedback voltage to the control module; the control module sends a first output voltage instruction or a second output voltage instruction to the to-be-tested mainboard, and a first output voltage value included in the first output voltage instruction is different from a secon