A synchronous switch valve core with a voltage stabilizing function, comprising: a valve core housing (1), a valve core base (2), a flow regulating module, and a balancing hydraulic module. The flow regulating module is capable of cutting off a cold/hot water path before water enters a pressure balancing module, thus preventing high-temperature water from immersing the valve core, preventing the building of lime scale, protecting the valve core, and extending the service life; moreover, water flow can enter the pressure balancing module only after flowing through the flow regulating module, thus preventing the channeling of hot and cold, and obviating the need to install a check valve at a water intake elbow. By means of an optimized design with respect to the parts of the synchronous switch valve core, the synchronous valve core is transformed from a switch capable only of regulating flow into a switch not only capable of regulating flow but also capable of synchronized switching, and also capable of balancing the pressures within two channels, thus transforming a product equipped with the vale core from a complex channel into a simple channel, and obviating the need for separately providing a balancing module part; a valve body is structurally simple, has a shortened water path, and is inexpensive.