Transmission-ratio-adjustable piling mechanism for construction site

The invention discloses a transmission-ratio-adjustable piling mechanism for a construction site. The transmission-ratio-adjustable piling mechanism comprises a base and a top frame; a fixing frame is mounted at the top of the base, and a first motor is mounted at the top of the fixing frame; the first motor penetrates through the top of the fixing frame and is rotationally connected with a first driving shaft, and the first driving shaft is of a lead screw structure; the first driving shaft is mounted in the fixing frame, and a driving shaft is connected with a movable frame; the transmission-ratio-adjustable piling mechanism is provided with an air cylinder, a movable rod, a guide groove and a driven shaft, the movable rod is pushed by the air cylinder to rotate, the driven shaft slides towards the outer side along the guide groove, in the process, the guide groove pulls a belt towards the outer side, due to the fact that the length of the belt is fixed, the belt extrudes a second driven disc and a compress