Floating disc with color-changing display function

The floating disc is composed of a plurality of module box bodies, and is characterized in that mounting holes are formed in the upper edge and the lower edge of each module box body, a color changing device is mounted on each module box body, each color changing device comprises an open shell, an oil inlet hole is formed in the bottom of each shell, and an oil guiding paper sheet extends downwards from the side edge of each open shell. A color changing layer is arranged on the shell, and the top of the oil guiding paper piece is in lap joint with the color changing layer. The working mode of the color changing device adopts a mode that the color changing layer and the oil product are subjected to chemical reaction, and the working mode of electric signal monitoring and transmission is mainly replaced by the color change, so that the problem of unsafety possibly caused by the electric signal transmission mode is avoided; due to the arrangement of an internal mechanism of the color changing device, the color c