The invention relates to a wall crack slurry pouring device which comprises a pressurizing mechanism (4), a material storage hopper (3) and a slurry injecting pipe joint (10), wherein the pressurizing mechanism (4) is fixed on a stand and is provided with a power mechanism (1). The device is characterized in that the pressurizing mechanism (4) consists of a rotor, a circular U-shaped outer casing(15) and a slurry blocking device (18), wherein the rotor is connected with the power mechanism (1); a circular rotary casing (14) is fixed on the radial end surface of the rotor; a slurry pushing block (12) is fixed on the circumference of the radial end surface of the circular rotary casing (14); the circular U-shaped outer casing (15) is fixed on the stand; mutually matched sliding passages (21) are arranged between the edge of the U-shaped opening end of the circular U-shaped outer casing (15) and the edge of the circular rotary casing (14); a slurry delivering cavity (16) is surrounded by the circular U-shaped outer casing (15) and the circular rotary casing (14) through the sliding passages (21); and the slurry block device (18) is fixed on the stand.