The invention discloses a solar glass flange machining lathe fire head control device. Circuit output of an infrared temperature measuring sensor is converted into a corresponding voltage signal through an acquisition circuit, the voltage signal is transmitted to an A/D switching circuit of a PLC chip to become a digital value, the digital value is compared with a preset voltage to judge the gas flow in a gas supplying flow valve, and the voltage signal deviation E and the deviation change rate EC are obtained through the PLC chip; and a PLC works out a corresponding control signal according to a fuzzy algorithm through the obtained voltage signal deviation E and deviation change rate EC, the control signal is converted into a corresponding current signal to be input into a flow control valve to control the valve opening of the flow control valve so as to control the flow of gas, and thus a glass lathe fire head is controlled. The glass lathe fire head is controlled easily, the controleffect on the fire head temperature is good, a glass flange is fired strictly according to production process requirements, and the quality requirement for glass flange production is met.