Gas supply mixing device and water heater

The utility model relates to a gas supply mixing device and a water heater, and the gas supply mixing device comprises a mixing mechanism which is internally provided with a mixing cavity, and an air inlet, a gas inlet and a mixing outlet which are communicated with the mixing cavity; the turbulent flow mechanism is arranged in the mixing cavity, the turbulent flow mechanism comprises a main body and at least two turbulent flow pieces arranged on the surface of the main body in a protruding mode, and all the turbulent flow pieces are spirally distributed around the central axis of the main body; and air input from the air inlet and fuel gas input from the fuel gas inlet are mixed in the mixing cavity, are guided by the spoilers and then are output from the mixing outlet. The water heater comprises the gas supply mixing device. According to the gas supply mixing device and the water heater, most of air and fuel gas entering the mixing cavity can flow in a turbulent flow mode, the air and the fuel gas are evenl