Self-operated water mixing system

The invention relates to the field of water mixing systems, and discloses a self-operated water mixing system. The self-operated water mixing system comprises a first pipeline, a second pipeline and a self-operated balance pipe, wherein a water inlet of a heat source is connected with a water outlet of user terminal equipment; a water outlet of the heat source is connected with a water inlet of the self-operated balance pipe through the first pipeline; the self-operated balance pipe is provided with an expansion head inserted into the second pipeline, and the expansion head is provided with a water outlet communicating with the water inlet of the self-operated balance pipe; a water inlet of the user terminal equipment is connected with the water outlet of user terminal equipment through the second pipeline; when the temperature is too high, the expansion head expands, the area of the water outlet of the expansion head decreases, the water discharge quantity decreases, and the volume of water flowing into the