The invention discloses a liquid sucking valve of an emulsion pump. The liquid sucking valve comprises a main body, a pump head and a liquid inlet; a valve sleeve, an alloy steel ball and a valve base are arranged in the main body in sequence from top to bottom; the valve sleeve is connected with a notch of the valve base; the pump head is mounted on the main body; and the liquid inlet is formed below the main body. The liquid sucking valve of the emulsion pump is simple in structure, reduces pump station faults, lowers the noise, and improves the start rate.