The invention provides an assembly type wall structure with a door or window and a mounting method thereof, and relates to the field of wall assembling. The assembly type wall structure with the dooror window comprises a frame and an enclosure wall embedded in the frame. The frame comprises a top beam and a bottom beam which are vertically spaced, and two stand columns which are spaced left and right, the enclosure wall comprises an upper wall and a lower wall which is arranged on a door opening or window opening, wherein the upper wall and the lower wall are arranged in a split manner, the upper wall is connected to the lower side of the top beam, the lower wall is connected to the upper side of the bottom beam, the door opening or window opening is located below the upper edge of the lower wall, a viscoelasticity damping layer is arranged between the upper edge of the lower wall and the lower edge of the upper wall, and the sides, close to the lower wall, of the two stand columns are provided with wall constraint structures used for preventing the lower wall from inclining. If the top beam is in vertical deforming due to the earthquake effect, through the deforming of the viscoelasticity damping layer, the extrusion force is subjected to buffer and absorbing, the lining isolation protection effect is achieved, and the use reliability under the emergency condition can be ensured.