The invention relates to a pipeline pressure monitoring device and a manufacturing method thereof. The monitoring device comprises a clamping ring and a measuring rod, wherein the clamping ring hoopsa pipeline, the clamping ring is an open ring, and a first connecting piece and a second connecting piece are correspondingly and fixedly arranged at two ends of the opening of the clamping ring; themeasuring rod is connected to the first connecting piece through a spring, the measuring rod is located at the opening and is arranged in the direction tangent to the clamping ring, threads are formedin the measuring rod, a through hole allowing the measuring rod to penetrate through is formed in the second connecting piece of the clamping ring, and the measuring rod penetrates through the corresponding through hole and is screwed with a measuring rod nut. When no water exists in the pipeline, the measuring rod nut abuts against the second connecting piece, the clamping ring is attached to the pipeline, and meanwhile, the spring is in a natural state; after water passes through the pipeline, the pipeline is expanded in the radial direction under the water pressure so as to drive the spring to stretch, and the value of the pipeline pressure is calculated by measuring the stretching length of the spring.