The invention discloses a method for producing mask plates of organic electroluminescent displays, which comprises following steps: taking a sheet of magnetic conductive thin sheet steel, utilizing stainless steel etching or laser cutting to open holes on the thin sheet steel to form patterns, flatly spreading a silk screen on the thin sheet steel with the patterns, coating mucilage which is used to stretch the silk screen on the edge of the thin sheet steel, then, removing the silk screen on the region of thin sheet steel patterns, then, stretching the silk screen, taking a frame body, clinging the frame body on the stretched silk screen to form a net frame, tailoring along the outer margin of the net frame after bonding stably, cutting another magnetic conductive sheet steel into an outer frame of the mask plate which is needed, then, connecting the outer frame of the mask plate and the magnetic conductive thin sheet steel in the net frame, then, cutting off the silk screen, shedding the net frame, lastly, cutting off excess sheet steel along the outer margin of the outer frame of the mask plate, and finishing producing the mask plate. The method of the invention utilizes the silk screen to stretch the thin sheet steel, which lowers the production cost and simplifies the technological process, the net frame is more stably connected with the outer frame, the operation is comparatively simpler, and the precision is greatly increased.