The utility model belongs to the technical field of application of automatic door accessories of airtight operating rooms, and particularly discloses an adjustable door shield which comprises a guide rail, a left lifting appliance, a right lifting appliance, a left door clamp, a right door clamp, a transverse L-shaped plate, a transverse L-shaped plate screw hole, a circular inner thread sleeve, an outer
threaded rod, an anti-skid adjusting column, a blocking part, a locking nut and the like. The lifting appliance has the beneficial effects that the transverse L-shaped plate, the transverse L-shaped plate screw hole, the circular inner screw sleeve, the outer
threaded rod, the anti-skid adjusting column, the blocking part and the locking nut which are matched for use are designed, so that the lifting appliance has a horizontal adjusting function, the safe
stroke positioning adjustment of the left lifting appliance and the right lifting appliance which move along with the
speed reduction wheel is realized, and the lifting appliance is practical; the internal thread transition fixing sleeve, the circular transition block and the blocking part mounting groove are matched for use, so that the blocking part is conveniently assembled or disassembled, maintained and replaced; and the blocking part with a rubber structure has a certain elastic function, so that the left lifting appliance and the right lifting appliance which move along with the
speed reduction wheel on the guide rail are blocked and positioned in a buffering manner, and the safety of the door body is ensured.