The invention discloses a cooling type clapboard for a U-shaped stuff back-feeder, and relates to technology of a solid material back feeding device. The clapboard comprises an intermediate clapboard vertically arranged between a descending pipe and an ascending pipe of the U-shaped stuff back-feeder and a stuff back feeding clapboard vertically arranged between the ascending pipe and a refeed pipe; wherein the intermediate clapboard and the stuff back feeding clapboard comprise a cooling pipe bundle and a refractory abrasive-resistant material coated outside the cooling pipe; at least one end of the cooling pipe bundle penetrates the shell of the stuff back-feeder, and is communicated with a header which is arranged outside the shell of the stuff back-feeder; a cool working substance is introduced into the cooling pipe. The cooling type clapboard for the U-shaped stuff back-feeder has simple structure and smooth process of the working substance, ensures that the intermediate clapboard and the stuff back-feeder of the U-shaped stuff back-feeder can be cooled, prolongs service life of the clapboard, and ensures long-term safe and stable operation of the stuff back-feeder.