The invention discloses an efficient PVC guardrail cutting-off machine. The cutting-off machine comprises a discharging frame, foot stands, a stop plate, a feeding frame, universal wheels, a ruler bar, a baffle, a work-piece, a pressing frame, a cutting oil tank, a control device and a power distribution cabinet. The discharging frame and the feeding frame are connected to the two ends of the power distribution cabinet. The foot stands are connected under the discharging frame and the feeding frame. The universal wheels are arranged at the bottoms of the foot stands. The ruler bar and the baffle are arranged above the discharging frame. The stop plate is arranged above the feeding frame. The pressing frame, the cutting oil tank and the control device are arranged above the power distribution cabinet. A guide plate and the work-piece are arranged above the power distribution cabinet. According to the cutting-off machine, hidden saw blades are low in noise and high in safety, one or more saw blades can be used for sawing together, and the sawing precision can be improved by means of the 800-mm feeding guide plate; oil can be ejected from the two sides automatically, the oil amount can be adjusted separately, burrs on cut faces are avoided, and the saw blades are more durable. By means of computer machining, the sawing precision is high, and operation is easy.