The invention discloses a flapper floor brush, which comprises a shell and a bent pipe connector arranged on the rear part of the shell, wherein the shell consists of an upper cover and a bottom plate, a dust absorption cavity communicated with a bent pipe is formed in the shell, and the bottom plate is provided with a dust absorption port. The floor brush is characterized in that: the bottom plate is connected with the upper cover through guide mechanisms positioned on two sides of the shell; the guide mechanism comprises a spring, a spring seat fixed at the bottom of the spring, and a connecting block fixed at the top of the spring, wherein the spring seat is connected with the bottom plate, and the connecting block is connected with the upper cover; and a motor is arranged in the dust absorption cavity, the bottom of the motor is fixed with the bottom plate, the two sides of the motor are provided with an output rotating shaft respectively, and each rotating shaft is provided with at least two eccentric blocks. By arranging the motor, eccentric counterweight wheels and the guide mechanisms and using different gravities of two sides of the eccentric counterweight wheels and the elasticity of the guide mechanisms, the up-and-down movement of the bottom plate is realized; and the dust is absorbed after the fleece fabric is flapped, so that the dust absorption effect is improved.