An omnidirectional treadmill platform includes a splicing floor, an omnidirectional driving base and a floor removing/splicing actuator. A plurality of omnidirectional wheels are arranged in the driving base. The splicing floor is placed on the omnidirectional wheels. A user moves on the splicing floor, and the omnidirectional wheels of the driving base cause the splicing floor to move in a direction Opposite to the movement direction of the user thus enabling the user to experience unlimited free movement, while in reality remaining in place. The splicing floor is formed by splicing a plurality of splicing blocks. The floor removing/splicing actuator removes and splices the splicing blocks at right positions, recycling splicing blocks and achieving the unlimited extension of the splicing floor. The new platform provides unrestricted movement and variable ground surface simulation irrespective of turn radius with near-negligible inertia force without the use of special footwear.