Environment-friendly fireproof air duct capable of being assembled modularly

The utility model provides an environment-friendly modularization assembly fireproof air duct, including straight pipe module and bend pipe module, the straight pipe module is internally fixedly connected with an internal frame, the surface of the internal frame is fixedly connected with a transverse plate and a vertical plate, the internal frame includes an internal support, a port cross beam and a port longitudinal beam, and the port cross beam and the port longitudinal beam are fixedly connected with the bend pipe module. Two ends of the internal support are fixedly connected to the port cross beam, one end of the port cross beam is fixedly connected to the port longitudinal beam, two ends of the vertical plate are fixedly connected with vertical plate bosses, the vertical plate bosses and one end of the transverse plate are provided with slots, one side of each slot is fixedly connected with angle iron, the angle iron is fixedly connected with the internal frame, and one end of the port cross beam is fixe