Automatic detergent feeding system

The invention discloses an automatic detergent feeding system, which is arranged between a washing drum and a water inlet of a washing machine. The automatic feeding system comprises a main water inlet passage, a cleaning water passage, a detergent container and a constant volume container, wherein the main water inlet passage is provided with a venturi pipe capable of generating negative pressure when water flows, the rear side of the outlet of the venturi pipe is provided with a bypass branch pipe for extracting the negative pressure, the bypass branch pipe is communicated with the constant volume container, the cleaning water passage and the detergent container are communicated with the constant volume container respectively, the constant volume container is communicated with the washing drum through a water outlet pipeline, and a one-way valve for preventing a detergent from reflowing to the water inlet is also arranged in the cleaning water passage; and a main water inlet valve is arranged between the main water inlet passage and the water inlet, a cleaning water valve is arranged between the cleaning water passage and the water inlet, a cleaning control valve is arranged at the connected position of the cleaning water passage and the constant volume container, a closing control valve for closing a connected port is arranged at the connected port of the constant volume container and the bypass branch pipe, and the water outlet pipeline is provided with a water outlet control valve. The automatic feeding system has simple structure and improves the clothes washing efficiency.