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In the ground test of attitude and orbit control engine, it is necessary to control the opening and closing of fast response electromagnetic valves, and accurately measure the load current. Aiming at the problems in this application, a high-speed solid-state relay interface circuit was realized. A digital control circuit for the isolation, logical judgment and amplification of all control signals, a load circuit which can switch the common-anode and common-cathode connecting mode of loads and suppress the back EMF(Electro-motive Force) of inductive load, and a current measurement circuit with isolated output were designed. Error analysis, test and calibration prove that the delay of digital control signal did not exceed 150ns and the accuracy of current sensing is 0.2074%. This circuit can be widely used in the interface between various controller and solid-state relays, and the application of current measurement.