The method of replacing traditional photoelectric sensor with TCS230 color sensor was put forward to realize coil correction in color mode. The hardware of collection system was built based on structure of complementary staggered layout between the two sensors. In the case of RGB three filters of TCS230, the output values were collected according to the measuring method of pulse width and these data were analyzed and relative ratio processed; the colors were fuzzy identified; and automatic selection of acquisition system filter was implemented. The experimental results showed that the optimal filter can be automatically selected when the coil materials are of different colors, and the requirement of correction controller with high accuracy is achieved.