The invention discloses a fuzzy control system for the coating temperature of a steel pipe. The control process includes the steps as follows: (1) a temperature sensor circuit outputs a correspondingvoltage signal converted by a voltage acquisition circuit to an A/D conversion circuit of a PLC chip, and the A/D conversion circuit converts the voltage signal into digital quantity, whether the coating surface temperature of a steel pipe reaches a preset requirement is determined by comparing the digital quantity with a preset voltage quantity, and the PLC chip obtains the voltage deviation andthe change rate of voltage deviation; and (2) a PLC calculates out a corresponding control signal through a fuzzy algorithm according to the voltage deviation and the change rate of voltage deviation,and converts the control signal into the output temperature of a heating furnace, so as to realize control on the coating surface temperature of the steel pipe, wherein the fuzzy algorithm includes the fuzzification of the input voltage value of a temperature sensor, a fuzzy control rule and the defuzzification of fuzzy control quantity. With the fuzzy control system of the invention, the coatingtemperature of a steel pipe can be controlled simply, an optimal temperature control effect is achieved, and manpower cost is reduced. The fuzzy control system well adapts to the nonlinearity, variability and complexity of the coating work.