The utility model discloses a building door opening structure of shear walls. The structure comprises the shear walls and a building door opening between the shear walls. A structural hole is formed in the building door opening, and concrete of the structural hole is of an after pouring mode. The structural hole is anchored into an upper beam-plate and a lower beam-plate through longitudinal ribs in the longitudinal direction, and is planted into the shear walls nearby through stirrups in the transverse direction, and the span of the connection beam equals the sum of the width of the building door opening and the width of the structural hole. The structure meets the use requirement of owners, shortens the construction period, and solves the problems that small wall pier construction is troublesome and design quality is difficult to guarantee.