Automobile four-wheel drive system and longitudinal trafficability testing device

The utility model relates to an automobile four-wheel drive system and a longitudinal trafficability testing device, which are characterized by comprising a testboard and a supporting assembly supporting the testboard, the testboard is provided with a left slope plate and a right slope plate which are inclined oppositely, the upper ends of the two slope plates are connected to form a table top, and the two slope plates and a supporting surface below form a triangular modeling structure. The testboard can enable three wheels in front and rear wheels of an automobile to be tightly attached to one side slope plate to pass through and enable the other wheel of the automobile to be suspended above the other side slope plate to form a four-wheel drive system test posture with one suspended wheelon one side, and can also enable the top of the testboard to be located between the front and rear wheels of the automobile to form a longitudinal passing angle test posture. The device can be used for testing the performanc