The invention discloses a pipe cutting device. The pipe cutting device comprises a base, a retaining plate, a fixing column, a support column, a cutting device and a sound isolation plate, wherein the base is of a rectangle shape; the retaining plate is vertically arranged on the side surface of the base; the fixing column is fixedly arranged on the side surface, facing the upper surface of the base, of the retaining plate through a thread rod; one side surface, adjacent with the retaining plate, of the base is inwards depressed to form a slide groove; a slide block is fixedly arranged on the support column; the slide block is clamped into the slide groove, and can be slide along the length direction of the slide groove; the sound isolation plate is fixedly arranged on the other side surface, adjacent with the retaining plate, of the base, and is crossed with the retaining plate; the cutting device is arranged on the side surface, facing the base, of the support column, and can be slide along the length direction of the support column; the upper surface of the base is provided with scales which are matched with the cutting device. The pipe cutting device has the advantages that the problems of single function, poor cutting accuracy, complicated operation and low working efficiency of the denoising pipe cutting machine of the prior art are solved; the problems of noise production and pollution to surrounding environment in the cutting process are solved.