The present invention relates to an elliptical sports machine with the tread-board orbit being adjustable, which comprises a skeleton, a movable bracket, a driving device, a right suspension arm, a left suspension arm, a right supporting rod, a left supporting rod, a right tread-board and a left tread-board, wherein, the movable bracket is provided with a right bracket body and a left bracket body, which are connected with each other through a motion part, and both the right and the left bracket bodies are provided with a bearing part and a rotation-shaft part, which are arranged at the back of the motion part; the rotation-shaft parts of the bracket bodies are coaxially hinged to the skeleton; the straight-line distance between the rotation-shaft part of the bracket bodies and the motionpart is more than the straight-line distance between the rotation-shaft part and the bearing part; the driving device is arranged on the skeleton and is provided with a motor, and the force output thereof is connected with the power of the motion part of the movable bracket; both the right and the left suspension arms are provided with a suspension end and a swinging end; each of the right and the left supporting rod is provided with a return-winding part and a swinging part that is arranged after the return-winding part, and the return-winding part moves on a closed orbit corresponding to the skeleton, and the swinging part is hinged on the swinging end of the corresponding suspension arm; each of the right and the left tread-boards is respectively supported by the two supporting rods directly or indirectly. The driving device has high work doing efficiency; moreover, with the elliptical sports machine, the user can directly acknowledge of the inclined degree of the tread-board orbit.