The invention discloses a rotary feed valve which comprises a shell, a rotor contained in the shell, a feed inlet formed in the upper part of the shell, a feed outlet formed in the lower part of the shell, and a pressure relief vent formed in the shell, wherein the pressure relief vent is located on the shell on one side corresponding to the return path of the rotor, and the pressure relief vent is communicated with a radial plate interval space of the rotor. The pressure relief vent is formed in the shell of the rotary feed valve provided by the invention, the pressure relief vent is used for releasing high-pressure fluid which is obtained from the feed outlet in the return path of the rotor and deposited in the radial plate interval space in advance, when the returned radial plate interval space of the rotor reaches the feed inlet, less high-pressure fluid is left, so that the high-pressure fluid is effectively prevented from blocking materials at the feed inlet, and the feed efficiency is increased.