The invention discloses a cell power supply type explosion-proof transmitter application method. The method comprises steps that (A), during mounting, a mounting seat is disposed on a mounting platform, and a thread hole of the mounting seat is made to be level with a thread hole of the mounting platform; (B), a movable board is turned, and the movable board is arranged above a fixed board; (C), a bolt is screwed into the thread hole, the mounting seat is fixed on the mounting platform through a nut; after mounting is accomplished, the movable board is taken down, the position of a protection cover is adjusted, and the protection cover is made to be embedded on the nut; and (D), during maintenance, the protection cover is taken down from the nut, the movable board is lift up to loosen the nut, and the mounting seat is taken down from the mounting platform. The method is advantaged in that through arranging the fixed board, the movable board and the protection cover, the bolt, the nut and the thread hole used for fixing a pressure transmitter are made to be isolated from rainwater, the parts can be prevented from being corroded by the rainwater, and a problem of maintenance difficulty caused by incapability of taking the pressure transmitter down from the mounting platform because of corrosion of the parts in the prior art can be avoided.