The invention discloses a discharging apparatus and a discharging method used for all-area uniform discharging of a rectangular pyrolysis furnace. The apparatus comprises a plurality of outer shells which mutually parallel and are connected to the bottom of the pyrolysis furnace or a pyrolysis cooler, and the upper portion of every outer shell is a wedged discharging hopper; rotating rollers are arranged below the material outlet of the wedged discharging hopper in every outer shell, the rotating rollers are fixed on the corresponding outer shell through a sealing device, and the rotating roller are connected to a driving system; every rotating roller comprises a rotating shaft, rotating drums and V-shaped grooves; and the rotating shaft is provided with a plurality of blades perpendicular to the rotating shaft, one V-shaped groove is formed between every two blades and has an outward wide opening and an inward narrow opening, the top ends of the blades between two adjacent V-shaped grooves are connected through an arc surface in order to form the rotary drum, the rotary drums and the V-shaped grooves are alternately arranged, and the bottom of every outer shell is an open discharging opening. The discharging apparatus used for all-area uniform discharging of the rectangular pyrolysis furnace has the advantages of realization of uniform discharge of solid materials in the rectangular pyrolysis furnace, realization of uniform pyrolysis reaction and uniform cooling of hot semi-coke by the moving bed rectangular pyrolysis furnace, and improvement of the quality of semi-coke products.