The utility model discloses a belt chute of a coke dry quenching system. The device comprises a feeding part, two symmetrical inclined chutes are formed in the bottom of the feeding part, gate valvesare arranged on the inclined chutes, a discharging part is arranged at the bottoms of the inclined chutes, a platform structure is arranged between the inclined chutes on the two sides, and the horizontal projection of an inner cavity of the feeding part is completely located in the area of the platform structure; and a discharging buffer structure is arranged on the inner side of the dischargingpart. According to the utility model, the platform structure is arranged; according to the structure, a part of coke can be directly accumulated on the platform structure; according to the utility model, the chute is internally provided with the bulges, so that coke directly falls on the coke accumulated into the bulges after entering the chute, i.e., the coke entering the chute in advance plays arole in buffering the subsequent coke, thereby avoiding the direct impact of the coke on the interior of the chute, greatly reducing the wear consumption of the interior of the chute and prolonging the service life of the chute.