PURPOSE: A gas emission device for an injection molding cylinder is provided to receive outside air into the device after removing moisture from the air and process the air, thereby removing factors causing defectiveness of a molded product. CONSTITUTION: A gas emission device for an injection molding cylinder (1) comprises a base member, a material input pipe, a slide supporting plate (30), a rotary slide plate (40), a fastening fixing member, a locking member and a material discharge pipe (80). The fastening fixing member is coupled to a clamp lever and a fixing bracket with a screw and is used to lock or unlock the other part of the rotary slide plate. The locking member is matched with first to third locking holes (33a-33c) in order to lock the rotation of the rotary slide plate. The material discharge pipe is assembled in the lower side of the slide supporting plate.
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