Interactive device for VR system

The invention provides an interactive device for a VR system, which comprises a seat, a foot control mechanism, a display and a host computer, wherein the host computer is connected with the display;the foot control mechanism comprises a selection switch and a displacement input mechanism; the selection switch is connected with the host computer; the displacement input mechanism comprises a footpedal part, universal wheels and a sensor for detecting the displacement of the displacement input mechanism; the universal wheels and the sensor are all arranged on the lower surface of the foot pedal part; and the sensor is connected with the host computer. An experiencer stamps on the foot pedal part provided with the universal wheels to move, the displacement signals of the displacement inputmechanism detected by the sensor are converted to the electric signals, the foot control mechanism selects whether to apply the displacement of the displacement input mechanism to a virtual scene to realize spatial transformati