The invention discloses a paper cutting machine with a cleaning function, and relates to the field of paper product packaging and machining. The paper cutting machine comprises a cutting device and acleaning device; the cutting device comprises a support table, a cutting assembly and a conveying device, the cutting assembly is arranged above the support table, the conveying device is located below the cutting assembly, and the cutting assembly comprises a roller and a round blade arranged on the roller in a sleeving manner; the cleaning device comprises a power device and a cleaning part usedfor cleaning the round blade, the cleaning part comprises a first cleaning part body and a second cleaning part body, the first cleaning part body and the second cleaning part body are both in sliding connection with a fixing rod, and the first cleaning part body and the second cleaning part body are symmetrically arranged on the two sides of the round blade; and the first cleaning part body andthe second cleaning part body are both connected with a power device, and the power device is used for driving the first cleaning part body and the second cleaning part body to move in the same direction or in the opposite direction. By means of the paper cutting machine, the blade can be maintained and cleaned under the condition that normal production is not influenced, sustainable production ofa production line is guaranteed, meanwhile, the product yield rate is guaranteed, and the beneficial effects of being quick and saving time and labor are achieved.