The invention discloses a peak-adjusting gas-fired boiler water supply flow and pressure double-balance type control system. The peak-adjusting gas-fired boiler water supply flow and pressure double-balance type control system is used for controlling the double balance of a water supply flow and pressure among a boiler drum and a variable-frequency water feeding pump and a power-frequency water feeding pump; when the variable-frequency water feeding pump is connected with an outlet pipeline of the power-frequency water feeding pump, the boiler drum is connected through a water feeding pipe; the system comprises an acquisition module, a control module and an execution module, wherein the acquisition module is used for acquiring a water supply flow signal, a water supply pressure signal, a boiler drum liquid level signal and a boiler drum pressure signal; the control module is used for generating a control signal of the water flow and the pressure according to the signal fed back by theacquisition module, and the execution module is controlled to perform operation; the execution module controls the running frequency of the water feeding pump and the opening and closing of a water supply adjusting valve according to the control signal of the control module. According to the system, the pressure and flow tracking adjustment can be realized, adjusting precision and response speed are improved, the tracking and adjusting controlling performance of boiler load fluctuation in a peak-adjusting process of a water supply system is better, and the operation working condition is stabilized.