Abstract: The present invention relates to a device for opening/closing wings in a wing body vehicle, and the device for opening/closing comprises: one pair of wings, which are installed so as to rotate with respect to a frame that is formed on an outer edge of a loading box; and the wing body vehicle comprising an opening/closing device for binding together lower ends of the wings and the frame, wherein the opening/closing device comprises a forward/reverse motor which is seated on the frame; an elevating plate, which is elevated and lowered vertically by driving the forward/reverse motor, for blocking a portion of lower end portions of the wings, a close button for elevating the elevating plate, and an open button for lowering the elevating plate. According to the present invention, an actuation button is operated when the wings are lowered thereby securely fixing the wings, and a user can solidly fix or release the wings by using the open button and the close button.