The invention discloses a baffle plate fixing device used for feeding during filter cover tapping. The baffle plate fixing device comprises an automatic tapping machine and a filter cover. A conveyingbelt is arranged on one side of the automatic tapping machine. A guide trough is arranged on one side of the conveying belt. A plurality of feeding troughs which are evenly distributed are arranged at one end of the guide trough. Positioning troughs matched with the feeding troughs are formed in the bottoms of the feeding troughs. A second adjustment motor is arranged at the bottom of the guide trough. Sliding grooves which are symmetrically distributed are formed in the bottoms of the positioning grooves. Baffle plates are arranged in the sliding grooves. Discharging rods are arranged at thebottoms of the baffle plates and are connected with the second adjustment motor through first racks. Positioning frames are arranged between the sliding grooves. The baffle plates are arranged in thepositioning frames. The positioning frames are arranged between the sliding grooves so that the baffle plates can be effectively fixed and can be more stable when moving rapidly.