The invention discloses a building wall grooving device which comprises a bottom plate, a fixing plate and a banister
brush, wherein universal wheels are fixedly connected to the bottom of the bottom plate, a third clamping groove is formed in the top of the bottom plate, a fixing support is fixedly mounted on the inner wall of the third clamping groove, and a first sliding groove is formed in the side of the fixing support. According to the building wall grooving device disclosed by the invention, after a grooving depth of a
cutting blade is adjusted, a bottom plate is pushed, a grooving
machine is moved to the side of a wall through universal wheels, and the grooving
machine is started, so that the wall is grooved through the
cutting blade, the
cutting blade can conduct rotary cutting through an arranged bearing; and through an arranged electric push rod, a top plate slides in the first sliding groove in the side of the fixing support through the T-shaped sliding block to
cut the whole wall, so that a worker can groove the wall without holding the grooving device, and the situation that the worker is hurt due to the fact that the grooving device slips out of the hand when the worker holds the grooving device for a long time due to
physical strength is avoided, and therefore, grooves formed by workers are attractive and tidy.