The invention discloses a bladder bush that can give out water to flush an object when brushing the object, so that the brushed object is cleaner and efficiency is raised. The brush comprises a brush body, an injection pipe, an inverted valve, a bladder, an osculum and brush hair; the injection pipe is installed in a brush handle; the inverted valve is installed on the injection pipe; one end of the injection pipe extends out of an interface from the brush handle end; an interface switch is installed on the interface; the other end of the injection pipe is communicated with the bladder; the fine osculum of the bladder are arranged at the root of the brush hair; and two-thirds of the back of the bladder expose the back of the brush body. The interface switch is opened; water is filled in the bladder through the injection pipe; the interface switch can be closed or the pipe can be taken away from the interface if lots of of water is not required; the inverted valve is used to stop water in the bladder from flowing back through the interface of the injection pipe; the osculum is fine; water won't flow out of the osculum naturally due to water surface tension; water flows out of the osculum by pressing the exposed bladder on the brush body when the object is brushed. In this way, the effect of brushing while washing is realized.