The invention discloses an alarm clock with multiple variable decoration effects. The alarm clock comprises a shell and an alarm clock main body, wherein the alarm clock main body is positioned inside the shell; the alarm clock main body comprises a clock body and a storage cabin; the clock body comprises a transparent clock cover and a dial plate positioned behind the transparent clock cover; clock pointers are arranged between the clock cover and the dial plate; the clock pointers are connected with a pointer shaft and the dial plate; the dial plate comprises a first decorative layer and a decorative cavity positioned behind the first decorative layer; at least two storage cavities are formed in the storage cabin; the decorative cavity is communicated with the storage cabin; at least two decorative pieces are further arranged on the alarm clock; the decorative pieces can slide back and forth between the decorative cavity and the storage cavities; and the first decorative layer is a transparent decorative layer. By adopting the alarm clock disclosed by the invention, multiple decorative effects can be achieved through different decorative pieces, and thus the user experience can be improved.