The utility model relates to the technological field of clock body structure, in particular to an easily changeable exterior frame structure of clock, which comprises an exterior frame, a plastic back cover and a press ring, the latter two of which are integrated into a whole through a piece of glass arranged between them, wherein a plurality of hatches are arranged on the peripheral of the integrated body, with a tilted block being arranged on the same side of each hatch. a plurality of clips are arranged inside the inner wall of the exterior frame corresponding to contact with the tilted block to clip tightly after entering into the hatches. With the structure above, the exterior frames of the bell body can be changed conveniently and rapidly to generate different visual and decoration effects by a plurality of exterior different appearances rather than more clocks, thereby achieving the purpose of save the resource.