The invention provides a dual-component high-pressure proportion-adjustable fire retardant coating spraying device which comprises a control mechanism, a main air feed pump, a feeding mechanism, a heating mechanism, a proportioning mechanism, a spraying mechanism and a cleaning mechanism. The control mechanism is a digital electronic controller, the input end of the main air feed pump is connected with an external air source, the output end of the main air feed pump is connected with the feeding mechanism, the heating mechanism, the proportioning mechanism, the spraying mechanism and the cleaning mechanism through an air pressure adjusting device, and a switch of the main air feed pump is connected with a main air switch of the digital electronic controller. According to the dual-component high-pressure proportion-adjustable fire retardant coating spraying device, the spraying efficiency is high, and the coating quality is good.