Elliptical motion machine

An elliptical motion machine comprises a machine frame, a lifting device, a motion base, a first linkage piece, a second linkage piece, a locking piece, a lifting device arranged on the machine frame and a motion base arranged on the second linkage piece, one end of the first linkage piece is pivoted to the rack, and the other end of the first linkage piece is pivoted to the moving base; one end of the second linkage piece is pivoted to the lifting device, and the other end of the second linkage piece is pivoted to the first linkage piece; the locking piece is arranged at the position close to the joint of the first linkage piece and the moving base and can be controlled to be located at a locking position and an unlocking position. When the locking piece is located at the locking position, the first linkage piece is fixedly connected with the moving base. When the locking piece is located at the unlocking position, the first linkage piece is connected with the moving base in a pivoted mode. 一种椭圆运动机包含一机架、一扬升装