The invention discloses a multifunctional vehicle with variable diameter wheels and skids. Except a basic structure of an automobile, the multifunctional vehicle also comprises the skids, a rubber baseboard and an elastic variable diameter wheel carrier, wherein the skids are mounted on the two front wheels of the conventional automobile and the variable diameter wheel carrier is arranged on a semi-shaft of the automobile; and the elastic variable diameter wheel carrier rotates a certain angle relative to a hub A and a hub C by a hub B and drives an elastic variable diameter part to rotate ina circumference direction of the hub B at the same time, so that the elastic variable diameter part is opened or folded to realize the wheel diameter variation of rear wheels of the automobile. In the invention, by adopting the combination of the skids and the variable diameter wheel carrier, the traffic capability of the multifunctional vehicle on a soft ground is improved, rolling resistance isreduced, a drive force is increased, and the vehicle body is supported by the skids in a shallow or intertidal zone, so that the vehicle body is prevented from sinking; and when the skids are dismantled and the wheel wheels are retracted to form round wheels, the multifunctional vehicle can run at a high speed on a road.