Abstract: Aiming at the characteristics of lead-acid battery of electrical locomotive in coal mine,the(paper) designed a PID controller of self-adaptive fuzzy based on self-adaptive fuzzy control theory and(presented) the design of software and hardware of control circuit of the charging device based on micro-(processor Inte)l80C196KC and FPGA.The experiment results indicated that the system could meet the charging (requirement) in high efficiency,fast and nondestruction.