The invention relates to a film removing method for a high light plate piece. A rack, a film stripping mechanism and a bracket horizontally and slidably connected on the rack are included; one end of the bracket is connected with a reciprocating transmission mechanism, and the other end of the bracket is connected to the film stripping mechanism; the film stripping mechanism comprises a film pasting plate, a counterweight drum and two telescopic shafts hinged to the bracket; transmission air cylinders are connected between the bracket and the telescopic shafts; the film pasting plate and the counterweight drum are parallelly mounted between the two telescopic shafts and are rotatably connected on the two telescopic shafts; a negative pressure cavity is formed in the counterweight drum; communicating holes communicating with the negative pressure cavity are formed in the counterweight drum; film cutting cutters are mounted at the ends, close to the film pasting plate, of the telescopic shafts; and the movement tracks of the film cutting cutters are parallel to the film pasting plate. Through implementation of the technical scheme, the effects of environmental protection and high efficiency in the film removing process is guaranteed.