Agricultural universal chassis with adjustable wheel track

The agricultural universal chassis comprises a frame assembly, four wheels and four lifting steering hydraulic driving devices, and the top surface of the frame assembly is a horizontal plane; the two ends of the front end and the two ends of the rear end of the frame assembly are each provided with a sliding transverse sleeve capable of moving transversely. Each sliding transverse sleeve is connected with a lifting steering hydraulic driving device, and each lifting steering hydraulic driving device is connected with a wheel through a wheel walking driving device; the front end and the rear end of the frame assembly are each provided with first transverse channel steel with an upward opening, and second transverse channel steel with a downward opening is connected into a groove of each first transverse channel steel. Sliding transverse sleeves are inserted into the two ends of each first transverse steel channel respectively, one or two transverse hydraulic oil cylinders are hinged to the middle of each firs