The invention relates to the technical field of concrete mixers, and discloses a building concrete mixer with the interior convenient to clean. The building concrete mixer comprises a base. A stirring bucket is arranged on the upper portion of the base. One side of the stirring bucket is fixedly connected with one side of a first sealant strip. The surface of the stirring bucket is fixedly connected with locating sliding grooves. The top of the stirring bucket is fixedly connected with the bottoms of threaded sleeves. The inner wall of the stirring bucket is fixedly connected with buckling grooves. The buckling grooves are in clamped connection with buckles. According to the building concrete mixer with the interior convenient to clean, through the threaded sleeves fixedly connected to the surface of the stirring bucket and threaded cranks penetrating threaded plates to be in threaded connection with the threaded sleeves, when the two threaded cranks and the two threaded sleeves are completely separated, a bucket cover can be taken down; and by means of a supercharging water gun in cup joint with a water outlet pipe, the supercharging water gun can be used for directly washing the inner wall of the stirring bucket and stirring blades, and the effect of facilitating cleaning of the interior of the stirring bucket is achieved.