The invention discloses a feed processing device for fish farms. The feed processing device comprises a supporting base, wherein a box body is fixedly installed at the top part of the supporting base,and a feeding hopper is fixedly installed at the top part of the box body; two sides of an inner cavity of the box body are fixedly provided with material distribution plates, two parallel crushing shafts are arranged on the lower sides of the material distribution plates, and the two crushing shafts are hinged to the box body through bearing seats arranged at two ends of the two smashing shafts;and two motors are fixedly installed on a right side plate of the box body, and rotating shafts of the two motors penetrate through the right side plate of the box body and are in transmission connection with the two smashing shafts through couplings. According to the feed processing device, the two procedures of drying and crushing feed are put together for processing, during use, the feed is dried first, and the dried feed is directly crushed so that time for recycling and transporting the feed can be saved, and therefore a lot of time can be saved, the working efficiency can be improved, the workload of people can be reduced, and use is more rapid and convenient.