Automatic limiting device and method for land and water conversion of high-speed amphibious vehicle

The invention discloses a high-speed amphibious vehicle land and water switching automatic limiting device and method.The device comprises a support, a micro hydraulic cylinder, a check block, a rotating shaft, a reset spring assembly and the like, the micro hydraulic cylinder is fixed to the right end of the support, the check block is rotationally connected with the lower end of the support through the rotating shaft, and the rotating shaft penetrates through the lower end of the support; the reset spring assembly is fixedly connected with the rotating shaft. The check blocks rotate and unfold under the thrust action of the micro hydraulic cylinders, and the requirement of the water working condition is met; the stop block rotates and resets under the action of the elastic force of the reset spring assembly, the land working condition requirement is met, a driver or other persons do not need to get off the vehicle to manually adjust the limiting stopper, the driver only needs to control the limiting stopper