A back-flushing plate (4) of a multifunctional oral care tool. The back-flushing plate (4) is provided at a back end of brush heads (1) and has an end portion lower than an end portion of the brush heads (1). A pair of brush heads (1) is driven to rotate by a pair of transmission rods (5), such that the brush heads produce a powerful suction flow. Sucked water splashes onto the back-flushing plate and generate a powerful flush flow, thereby attains a goal of flushing the oral waste away. It solves a problem of deep cleaning of furs and also solves a problem of waste liquid, such as tooth-brushing foam, remaining in an oral cavity.
