Novel full-premixing water-cooling gas-fired boiler

The novel full-premixing water-cooling gas boiler comprises a rack and a boiler body, a bottom box is arranged at the bottom of the boiler body, the bottom box is fixed to the rack, the boiler body comprises a front mounting plate and a rear mounting plate, a heat exchanger assembly is arranged between the front mounting plate and the rear mounting plate, and a combustor is arranged in the middle of the heat exchanger assembly; a cold water inlet pipe and a hot water outlet pipe are arranged on the outer side wall of the heat exchanger assembly, a full premixing fan is arranged on the front mounting plate, an air inlet pipe of the full premixing fan is connected with a gas proportional valve through a pipeline, the lower end of the gas proportional valve is connected with a gas filter, and a gas inlet pipe is arranged at the gas inlet end of the gas filter. Compared with the prior art, natural gas and air can be premixed and then enter the combustor to be ignited, so that combustion is more sufficient; the si