Water supply mother pipe pressure optimization control method and system, terminal and medium

The invention provides a water supply mother pipe pressure optimization control method and system, and the method comprises the steps: obtaining an optimal constant value of the pressure of a water supply mother pipe and an optimal combined operation mode of a constant-speed water supply pump and a speed-regulating water supply pump through an optimization algorithm of a pressure constant value and a combined mode according to the total water supply demand of a boiler; in the optimal combined operation mode, according to the optimal constant value of the pressure of the water supply mother pipe, the opening degree of any one or more speed regulation pump couplers is adjusted through a multivariable composite balance control algorithm, and the pressure of the water supply mother pipe is controlled; and feeding back the pressure of the water supply mother pipe and the opening control quantity of the speed regulation pump coupler to a multivariable composite balance control algorithm, and performing rolling opti