Water pressure adjusting method and device and gas water heater

The invention relates to the technical field of intelligent household appliances, in particular to a water pressure adjusting method and device and a gas water heater. The method comprises the steps that the water pump pressurization flow corresponding to the maximum water pump power of a water pump and the actual maximum water flow, the actual minimum water flow and the period duration in a water flow fluctuation period are obtained, and the initial water pump power is determined; determining a water pump power adjusting step length according to the initial water pump power, the maximum water pump power and the period duration; in the process that the water flow is reduced from the actual maximum water flow to the actual minimum water flow, the step length is adjusted based on the water pump power, the water pump is controlled to be increased from the initial water pump power to the maximum water pump power, and in the process that the water flow is increased from the actual minimum water flow to the actual