Long-service-life protection device for petroleum pipeline joint

The invention discloses a long-service-life protection device for a petroleum pipeline joint. The device comprises a first pipeline, a second pipeline and a base, the first pipeline communicates with the second pipeline through welding, check blocks are welded to the surfaces of the first pipeline and the second pipeline correspondingly, sleeves are arranged on the outer sides of the first pipeline and the second pipeline correspondingly, fixing rings are fixedly installed on one sides of the sleeves, and the two fixing rings are fixedly connected through bolts. According to the device, a connecting shaft which is rotationally connected is arranged, clamping blocks are fixedly connected to the outer side of the connecting shaft, a coil spring is arranged in a matched mode, the lower end of the clamping block abuts against the outer wall of the pipeline all the time, and when the two fixing rings are gradually and fixedly connected together through the bolts, the clamping blocks in the sleeves gradually move t