The invention relates to a smashing device for a refuse landfill. The device comprises a feeding mechanism, a smashing mechanism and a block pressing mechanism; the feeding mechanism comprises a feeding box, a rotating shaft is horizontally and rotatably connected into the feeding box, multiple spiral feeding blades are fixedly connected to the rotating shaft, the bottom wall of the feeding box communicates with a liquid discharge pipe, the end, away from the bottom wall of the feeding box, of the liquid discharge pipe communicates with a storage tank, the smashing mechanism comprises a smashing box, the top wall of the smashing box is vertically and rotatably connected with a smashing shaft, the upper portion of the smashing shaft is coaxially and fixedly connected with a spraying box, aspraying opening is formed in the bottom wall of the spraying box, a first magnet is arranged on the spraying opening, a check block is in sliding connection to the bottom wall of the spraying box, the bottom of the check block is fixedly connected with a second magnet attracted with the first magnet, a smashing blade and a spiral discharging blade are fixedly connected to the position, below thespraying box, on the smashing shaft, a discharging opening is formed in the lower portion of the spiral discharging blade, and the block pressing mechanism is located below the discharging opening. According to the device, garbage is pressed, and the waste pit space can be sufficiently used.