Online inspection polished rod clamping device for spring-loaded safety valve

The utility model relates to the field of gas well mining, and provides an online inspection polished rod clamping device for a spring-loaded safety valve. The online inspection polished rod clamping device for the spring-loaded safety valve is characterized by comprising a screw and a nut, wherein the screw and the nut are matched; the screw and the nut are connected via thread; the screw is fixed on the upper end of the polished rod of the spring-loaded safety valve; the nut is fixedly connected with the connection rod of the inspection device for the spring-loaded safety valve; and the connection rod of the inspection device for the spring-loaded safety valve drives the nut to mode upwardly. The online inspection polished rod clamping device for the spring-loaded safety valve is simple in structure and low in production cost, and only one adjusting screw and the nut are additionally welded; if the nut and the adjusting screw has enough strength, and the inspection device permits, inspection on the spring-l