The invention discloses an impeller water-spraying oxygen-increasing machine, wherein a motor (11) is arranged above a support body (2), the support body (2) is connected to one end of a support rod (5) in a trisection mode, the other end of the support rod (5) is provided with a floating ball (9), a shaft of the motor (11) is provided with an impeller shaft (14) through a coupler (13), and the impeller shaft (14) is provided with an impeller (18). The impeller water-spraying oxygen-increasing machine is characterized in that a water outlet body (16) is arranged below the support body (2), the impeller shaft (14) penetrates through the centre of the water body (16), a water inlet cover (8) is arranged below the water outlet body (16), and the impeller (18) is positioned in a cavity formed by the water outlet body (16) and the water inlet cover (8). A spiral membrane on the water-outlet body enables the spraying water to be in a rotation state so that the water can contact with the air for a longer time, the water and the air are further mixed, convection and exchange of a bottom-layer water body and an upper-layer water body are realized, and the oxygen-increasing capability is improved.