The invention belongs to the field of electro-hydraulic suspension systems and discloses a control valve for electro-hydraulic suspension systems of small-and medium-horsepower tractors. The control valve comprises a valve body, an overflow valve, a check valve, a two-position two-way electromagnetic valve, a two-position three-way electromagnetic valve, an oil outlet A, an oil inlet P, an oil return port T and a pressure testing oil port, and the overflow valve, the check valve, the two-position two-way electromagnetic valve, the two-position three-way electromagnetic valve, the oil outlet A,the oil inlet P, the oil return port T and the pressure testing oil port are mounted on the valve body through insertion. The valve body is internally provided with oil passages communicated with valve part oil ways, the oil inlet port P is connected with an oil cylinder, the pressure testing oil port is connected with a pressure meter and a switch, the oil outlet A is connected with a hydrauliccylinder, and the oil return port T is connected with an oil tank. The control valve has advantages of cost saving, compact structure, high response speed, convenience in connection with external oilways and hydraulic cylinders and convenience in electronic control.