Anti-retreating door shaft device of light iron door

The utility model utility provides an anti-retreating door shaft device for a light iron door. The anti-retreating door shaft device comprises a fixed door shaft, a rotating shaft sleeve, a positioning block, a blocking arm, a spacer bush, a gland, an oil nozzle bolt, a bearing, a thick shaft section shaft step, a slide way, a blocking block, a thin shaft section shaft step, an arm body, a fixed pin shaft and a roller, the fixed door shaft is composed of a thick shaft section shaft step, a thin shaft section shaft step, a fan-shaped boss sliding way machined on the outer edge of the upper end of the thick shaft section shaft step and a semi-trapezoid check block welded to the surface of the sliding way. The blocking arm is of an L-shaped structure with a square section; the upper end part of the arm body is bent to form a blocking arm lifting handle; a fixed pin shaft hole is formed in the lower end part of the arm body parallel to the direction of the handle and is matched with the fixed pin shaft; and a gro