The utility model discloses a mortar spatula convenient to fill door frame gap. Preceding, the back both ends and the right -hand member of rectangle spatula are equipped with preceding baffle, backplate and right baffle respectively, and the cross section of cavity is isosceles trapezoid, and the left end of preceding baffle and backplate is all established to the inclined plane, right side baffle is preceding, back, upper and lower center is equipped with flexible hole, the upper left end of handle be equipped with with the communicating guide way of hole, the interior downthehole push rod that is equipped with, push pedal and rubber slab can be released the mortar in the cavity left, the right part of push rod is equipped with the retaining ring, and spring pocket establishes and servesat the external diameter of push rod, the upper end of the push rod on retaining ring the right is equipped with the screw hole, screw hole and screw rod hookup, and the guide block and guide way movable fit of screw rod upper end, the upper end of guide block is equipped with and pushes away the handle. The utility model discloses can not only accelerate the construction progress, still be favorable to keeping the hygiene on ground, the operation in door frame gap is filled in to the specially adapted.