Portable wall building and plastering tool

The utility model relates to the field of building wall masonry auxiliary tools, in particular to a portable wall masonry plastering tool. The plastering tool is placed at the top of a brick of a masonry wall and used for distributing mortar to the top of the brick, the plastering tool comprises a box body with an upper opening and a lower opening, the box body is used for containing the mortar and comprises a front side plate, a rear side plate, a left side plate and a right side plate, and the left side plate and the right side plate of the box body are located on the left side and the right side of the brick respectively. The left side plate and the right side plate continue to extend downwards and clamp the bricks, the front side plate of the box body is pressed on the tops of the bricks, the bottom edge of the rear side plate of the box body is higher than a gap reserved between the bricks, blocking rods are fixedly arranged on the inner sides of the left side plate and the right side plate of the box bo