The invention belongs to the field of tube cutting equipment, and particularly relates to a rapid tube cutter. The rapid tube cutter comprises a rack, a tube conveying mechanism, a tube clamping synchronous rotation mechanism, a cutter rest, a control system, a linkage rod, a hinge shaft, a first support arm, a second support arm, a third support arm, an electromagnet, an attraction component, an adjustment arm, a limit plate, a stroke switch, a first elastic component, a second elastic component, a third elastic component, a first infrared probe and a second infrared probe. With the adoption of the technical scheme of the invention, the cutting length of a tube is determined by presetting the distance between the limit plate and a blade assembly, thus reducing the errors due to visual assessment; meanwhile, the matching of a first motor, a second motor, the electromagnet and the stroke switch is realized by the control system, and automatic cutting for the tube can be realized only by placing the tube on a support wheel; compared with manual tube cutting, the rapid tube cutter disclosed by the invention is high in working efficiency; moreover, the tube cutter is compact in structure, relatively small in size, and convenient to move.