The invention relates to a polyvinyl chloride (PVC) pipe cutting device. The PVC pipe cutting device comprises a machine body and a machining table, wherein two clamping arms are arranged on the machining table in a sliding manner, a sliding plate is arranged on the machining table in a sliding manner, and an adjusting assembly is arranged on the sliding plate; a first screw rod is rotationally connected to the machining table, the machining table is fixedly connected with a slide bar, a transmission disc is arranged on the first screw rod coaxially, a plurality of transmission grooves are circumferentially formed in the driving disc at equal intervals, the transmission grooves are arranged in the radial direction of the end surface circle of the transmission disc, a drive disc is rotationally arranged on the machining table, and the machining table is fixedly connected with a fourth motor; bulges are fixedly connected to the drive disc, and an intermittent assembly is arranged betweenthe drive disc and the transmission disc; and a cutting table is arranged on the machining table in a sliding manner, a cutter is rotationally connected to the cutting table, the cutting table is fixedly connected with a first motor, and a cutting assembly is arranged on the machining table. By the technical scheme, the clamping and fixation effects on different pipes are realized, the fixed-sizecutting effect on the pipes is achieved conveniently, and the accuracy of pipe cutting sizes is enhanced.