The invention discloses a method for manufacturing a Reticle mask plate by using a FPD mask plate manufacturing device. The method comprises the following steps of: (1) transforming graphics designed by the Reticle mask plate into electronic data files which are identified by a Reticle mask plate exposing device by the computer aided processing; (2) putting the electronic data files obtained in step (1) on the raw material of the Reticle mask plate and carrying out the operation of the laser direct writing and photoetching by the Reticle mask plate exposing device; (3) developing the raw material of the Reticle mask plate; (4) etching the raw material of the Reticle mask plate; (5) stripping the Reticle mask plate from the raw material of the Reticle mask plate and cleaning the Reticle mask plate; and (6) attaching the protective film of the Reticle mask plate on the surface of the Reticle mask plate. The FPD mask plate mask plate manufacturing device is utilized to manufacture the Reticle mask plate, the investment is low and the production circle is short.