Provided is an active-oxygen laundry sheet for decontamination, sterilization and peculiar smell removal and a preparation method thereof. The active-oxygen laundry sheet is prepared from a film-forming agent, a non-ionic surface active agent, an anionic surfactant, a zwitterionic surfactant, a wetting agent, a filler, saturated hydrocarbon, an oxygen releasing agent, a chelating agent, a preservative, a food coloring, a natural perfume and the like and is prepared through weighing, pumping, sheeting and the like. The added oxygen releasing agent serves as an active-oxygen additive, the detersive power of the laundry sheet is improved, sterilization and peculiar smell removal functions are increased, and clothes can be washed cleaner.