The invention provides an outer wall surface structure and a manufacturing method thereof. According to the outer wall surface structure, a plurality of transverse clamping grooves are embedded in an outer wall surface, and a gap between the bottom edge of a front upper surface plate and the top edge of a front lower surface plate of each transverse clamping groove is a notch; a water fender is arranged inside each transverse clamping groove, and the first portion and the second portion of each water fender intersect at the angle of 135 degrees; the length of each first portion is greater than that of the corresponding second portion, and the width of each first portion is equal to that of the corresponding second portion; each second portion is clamped inside the corresponding notch, and the front side surface of each second portion makes contact with the rear side surface of the corresponding front upper surface plate; elastic pressing pieces are arranged inside each transverse clamping groove, one end of each elastic pressing piece is fixed on a rear surface plate, the other end of each elastic pressing piece is a free end warped forwards, and the second portion of each water fender is tightly pressed by the corresponding free ends and the corresponding front upper surface plate; the plural elastic pressing pieces are arranged in each transverse clamping groove, and a spring which is flexible in the front and back direction is arranged between each free end and the corresponding surface plate. According to the outer wall surface structure and the manufacturing method thereof, rain water can be prevented from forming water marks on the outer wall surface, and can also be prevented from causing cracking or falling-off of the wall surface.