Building outer wall punching device for constructional engineering

The utility model discloses a building outer wall punching device for constructional engineering, and relates to the field of punching devices, the building outer wall punching device comprises a protective shell, the bottom of the protective shell is fixedly connected with a handle, one side of the handle is provided with a control button, one end of the protective shell is fixedly connected with an electric push rod, and the end part of the electric push rod is embedded in one end of the protective shell. The tail end of the electric push rod is fixedly connected with a motor, and the tail end of the motor is in threaded connection with a drill bit. A push-pull block slides in a sliding groove, a round rod and a supporting plate are used in a matched mode, the protective cover can be pushed forwards, the protective cover covers a wall area needing to be drilled, the protective cover can prevent chippings from splashing, the protective cover is of a hollow circular truncated cone structure, the chippings can