Disclosed in the present invention is a self-feeder for sows, which includes a hopper, a feed volume adjusting mechanism, and a discharge mechanism. The feed volume adjusting mechanism is mounted in the hopper. The hopper includes a C-shaped housing, a front side plate, a bottom plate, and a guide plate. The front side plate is fixed on the front side of the C-shaped housing. The bottom plate is welded on the bottom of the C-shaped housing. A gap is disposed between the bottom plate and the front side plate and used as a discharge port. The guide plate is welded between the bottom plate and a rear wall of the C-shaped housing and is aligned with the bottom plate at the discharge port. The discharge mechanism includes a discharge plate, a push rod, a top cap, and a stop pin. The discharge plate is located above the guide plate. The top cap is located below the bottom plate. An upper end of the push rod passes through the bottom plate and the guide plate and is welded to the discharge plate. A bottom end of the push rod is welded with the top cap. The stop pin is welded on the push rod below the bottom plate. The present invention has a simple structure； the feed volume can be adjusted freely, and fodder can be discharged avoiding falling on the eyes and snout of a sow； the manual discharging times is reduced； the sow can eat fresh fodder and the fodder may not get out； therefore, the fodder is not wasted and the manpower is saved.
