Pipe cutting device used for cutting line pipe

The invention discloses a pipe cutting device used for cutting a line pipe. The pipe cutting device comprises an installing shell provided with a cavity inside, an installing sleeve installed on the installing shell in a rotating manner, a force exerting part installed on the installing shell in a rotating manner, a transmission part and a cutting part, wherein the transmission part is located inthe installing shell and connects the installing sleeve with the force exerting part, and the cutting part is installed on the installing sleeve. The cutting part comprises a sleeve ring which is fixedly connected to the end, away from the transmission part, of the installing sleeve. Elastic clamping pieces are uniformly arranged on the sleeve ring at intervals. Cutting teeth are fixedly connectedto the sides, facing the axis of the sleeve ring, of the elastic clamping pieces. Fixing parts for stringing all the elastic clamping pieces as a whole are arranged on the outer sides of the elasticclamping pieces. The pipe c