The invention relates to a spring safety valve debugging device which can perform online debugging and checking on a spring safety valve. The spring safety valve debugging device comprises a data processor, a force measuring sensor, a displacement transducer, a pressure transducer, a hydraulic cylinder, a bracket, a piston, a universal nut, a pull rod, a high-pressure oil pump and the like, wherein the hydraulic cylinder and the bracket are mounted on a regulating screw of the safety valve; a force measuring transducer is placed on the hydraulic cylinder; the pull rod passes through the hydraulic cylinder and is rigidly connected with a valve rod of the safety valve; and the displacement transducer is fixedly arranged on the bracket. During checking, high-pressure medium is injected into the hydraulic cylinder through the high-pressure oil pump, the piston drives a valve rod to move upwards, a measuring element transmits a displacement signal of valve opening, valve rod pull force andcontainer pressure data into a data processor, and set pressure and spring regulating amount of the safety valve are precisely calculated; and in a checking process, displacement of the valve rod is detected through the displacement sensor to judge whether the valve is opened or not. The spring safety valve debugging device has the advantages that set pressure of the spring safety valve can be precisely measured on line under pressure, and debugging and checking of the safety valve can be precisely and reliably performed according to the measured results.