The utility model relates to a conical ring screen vertical type feed grinder for grinding feed, comprising a feeding hopper, a grinder body drum, a ring screen plate, a rotor, a flat-bottom screen plate, a discharging hopper and being of a vertical type structure, wherein the rotor consists of a rotor shaft, a belt wheel at the upper end of the rotor, a rotor disc, hammer pieces, a hammer piece pin shaft, a hammer piece positioning sleeve, a scraping plate and an axial flow type draught fan impeller. The rotor is vertically distributed and is supported by a rotor supporting cross beam at the upper end. When the feed is ground, the rotor is driven by a motor arranged at the upper side to rotate at high speed; the feed is beaten by the hammer pieces to be ground and then is discharged by the ring screen and the flat-bottom screen plate; the ring screen plate of the grinder adopts a conical shape so as to be beneficial to overcoming adverse influence of a circulation layer, and the qualified granules can be screened out smoothly; simultaneously, the hammer pieces adopt a plurality of layers in the vertical direction, and the sizes of every two layers are the same; when in grinding, gaps of all layers of hammer pieces and the conical ring screen changes alternatively so as to generate disturbance for the circulation layer and further reduce the adverse influence of the circulation influence. The lower end of the flat-bottom screen plate is provided with the axial flow type draught fan impeller, the discharging of the feed out of the screen and the dissipation of heat generated by grinding can be accelerated.