The invention discloses a corrugated paper cutting device with a fixed cutting distance, convenience in adjustment and a protection function. The corrugated paper cutting device comprises a pushing plate and a supporting table, the pushing plate is slidably mounted on the upper portion of one end of the supporting table, a placing clamping groove is formed in the pushing plate, a movable clampinggroove is formed in the middle of the end, close to the pushing plate, of the supporting table in a penetrating manner, a cutting knife groove is formed in the side, away from the pushing plate, of the movable clamping groove and located in the supporting table in a penetrating manner, a connecting plate is fixedly connected to the middle of the outer end of the pushing plate, an adjusting deviceis installed below the supporting table, a cutting protection device is installed above the adjusting device, and a limiting plate is installed in the adjusting device. According to the corrugated paper cutting device, corrugated paper can be rapidly cut in the using process, the cutting distances of the cut corrugated paper are the same, it is guaranteed that the specifications of the cut corrugated paper are the same, an operator can be protected in the using process, and using and adjusting are convenient and rapid.