The invention relates to a feed supply device for farm breeding. The feed supply device for farm breeding comprises a sliding support (9) and a sliding part (6), wherein the sliding support (9) is installed above a feed trough (811) and extends in the forward and backward directions; the sliding part (6) is capable of sliding forward and backward in a sliding runway (920); the sliding part (6) comprises a sliding base (69), and support sliding feet (2) capable of elastic and telescopic sliding and matching parts (3) for forward and backward driving, which are respectively arranged on both sides of the sliding base (69) in a left/right symmetry mode; a sliding lifting block (5) is arranged between the two matching parts (3) for forward and backward driving; a lifting suspension loop (53) is fixedly fixed to the top of the sliding lifting block (5) and used for forming a joint with a hook (4) which is fixedly installed on the top wall of a dust-proof shell (80); the dust-proof shell (80) is fixedly installed on the upper end of the sliding support (9); and the lower end of the sliding base (69) is fixedly provided with a feed supply box (81) which is used for containing the feed.