Front guide supporting device

The invention provides a front guide supporting device. The front guide supporting device comprises an upper body, a lower body, a rocking handle, a bevel gear, a lead screw, a screw nut, a rotating shaft and a universal wheel. The upper body includes a fixed part and a moving part. The lower end of the fixed part is connected with the upper end of the lower body through the rotating shaft; the universal wheel is installed on the lower part of the lower body; the screw nut is connected to the upper end of the fixed part; the moving part sleeves the outer side of the fixed part, and the rockinghandle extends into the moving part from upper end of the moving part and is connected with the bevel gear located inside the moving part; and the bevel gear is connected with the lead screw locatedinside the moving part, and the lead screw is connected with the screw nut. An upper and lower split structure is adopted, the lower body is folded as a whole, so that the front guide supporting device quickly changes the heig