Provided is a disconnecting prevention rubber seat of a relief pipeline, belonging to the petroleum industry oil and gas well head control technology field and comprising a body, an oil pipe groove, convex eaves and a bolt groove. The center of the upper surface of the body is provided with the arced oil pipe groove and the center of the lower surface is provided with the arched bolt groove; two sides are respectively provided with two symmetrical convex eaves; the oil pipe groove is perpendicular to the bolt groove and the convex eaves. The effects are that the disconnecting prevention rubber seat can prevent back and forth movement of a rubber seat when a pipeline swings fiercely so as to avoid loss of an isolation function, eliminate hidden dangers of oil and gas explosion and pyrophoricity accidents caused by electrostatic sparks generated by direct contact among a ground anchor clamping plate, bolts and oil pipes in a relief pipeline, shorten operation time and save manpower and material resources, is simple to manufacture and benefits for popularization.