The present invention relates to a floating diffusible pesticide tablet formulation, a preparation method thereof, and a method for controlling pest by spray. The floating diffusible pesticide tablet formulation of the present invention includes an agricultural chemical active ingredient, a binder, a surfactant, a floating bulking agent, and a water soluble bulking agent. The surfactant is selected from a nonionic surfactant and an anionic surfactant.COPYRIGHT KIPO 2014본 발명은 수면 부유 확산성을 갖는 정제 및 제조 방법 그리고 살포에 의한 병충해 방제 방법에 관한 것이다.