The invention provides a lying skiing device which comprises a skateboard body, a semispherical transparent cover, a handle, support boards, connecting boards, hook boards, springs, side skateboards,U-shaped support rods, leg support boards, foot sleeves and foot sleeve fixing plates, wherein the front end and the rear end of the skateboard body are bent in an arc manner; two arc baffles are arranged at the front end and the rear end of the skateboard body; the two foot sleeve fixing plates are symmetrically supported between the rear arc baffle of the skateboard body and the skateboard body;foot sleeves are fixedly welded in the middles of the two foot sleeve fixing plates; the two side skateboards are symmetrically arranged on the left side and the right side of the skateboard body; the two side skateboards are connected with the skateboard body in a support manner via the three connecting boards welded on the inner side end faces of the two skateboards; and all components of a body of the skiing device, except the springs, are made from high-strength engineering plastics. With the adoption of the U-shaped support rods, the support structure strength of the side skateboards canbe improved by the U-shaped support rods, and fracture of the side skateboards can be effectively avoided when the skiing device is rolled over.