The invention provides an electromagnetic valve group testing device for a rotary guiding hydraulic system. The electromagnetic valve group testing device comprises a hydraulic pump, a pressure sensor, a pressure release valve, a circulating valve, electromagnetic valves, temperature sensors, a control system, a data acquisition system and an upper computer. The pressure release valve, the circulating valve and the electromagnetic valves are arranged on a testing valve seat. The valve seat is a hollow cylinder. The three electromagnetic valves are evenly distributed on the testing valve seat at the angle of 120 degrees. The pressure release valve and the circulating valve are located between two different electromagnetic valves. The control system of the testing device is realized through a measurement and control circuit. The measurement and control circuit of the control system can be used for controlling the five valves to move, and accordingly whether an electromagnetic valve group and related oil ways and circuits of the rotary guiding hydraulic system are smooth or not can be detected. By the adoption of the testing device, the service life of each single valve, response time and stability of each valve, response time consistency of all the valves in the valve group, reliability of the pressure release valve and smoothness of the oil ways can be detected.