Automatic steel pipe cutting device

The utility model relates to the technical field of cutting devices, and discloses an automatic steel pipe cutting device which comprises a supporting frame, a cutting body is arranged on the supporting frame, a material collecting box is arranged in the supporting frame and located below the cutting body, a replacement box is arranged below the material collecting box, and an exchange assembly is arranged between the material collecting box and the replacement box. Chalk crocodiles at the two ends of the exchange assembly are connected with the corresponding positions of the material collecting box and the replacement box, and shielding assemblies are arranged in the material collecting box and the replacement box correspondingly. According to the automatic steel pipe cutting device, the material collecting box is arranged below the cutting body, chippings generated during steel pipe cutting can be collected, the falling chippings can be recycled, the replacement box arranged below the material collecting bo