The invention discloses an automatic coal feeding boiler, which comprises a water tank, a combustion chamber, a fire grate, a chimney, a coal inlet, a coal pipe, a coal bucket, a carbon slag outlet, a filter screen, a first support plate, and a second support plate , a support frame, a chute, an electric valve, an inductor, a tension spring and a controller, a combustion chamber is provided at the bottom of the interior of the water tank, and the side of the combustion chamber is flush with the side of the water tank, and the The bottom of the combustion chamber is flush with the bottom of the water tank and the bottom of the combustion chamber is an open design. The interior of the combustion chamber is slidably provided with a horizontally arranged fire grate, and the upper part of the combustion chamber communicates with the outside of the water tank. chimney, the right side of the combustion chamber is provided with a coal inlet, the outer end of the coal inlet is connected to a coal scuttle through a coal pipe, and the left side of the combustion chamber is provided with a carbon slag outlet, which is different from the existing Compared with technology, it can automatically add coal to the boiler, which reduces the labor intensity of workers, improves the working performance of the boiler, and enhances the heat utilization rate of the boiler.