The present invention discloses a CAN bus protocol controller test method. The method comprises the steps of: performing reset function test of a CAN bus protocol controller, and obtaining a reset function test result; performing internal register test of the CAN bus protocol controller to obtain an internal register test result; performing reset operation of the CAN bus protocol controller, accessing a basic mode through configuration of a clock frequency division register, accessing at least two work modes through level selection of a mode pin, performing test of a receiving function, a sending function and an interruption function, and obtaining a basic mode test result; performing reset operation of the CAN bus protocol controller, accessing an expansion mode through configuration of the clock frequency division register, accessing at least one two work modes through level selection of the mode pin, performing test of the receiving function, a sending function and an interruption function, and obtaining expansion mode test data. The test method is high in practicability, simple in usage and reliable in operation.