According to the laser power supply requirements of semiconductor pumping fiber lasers with high power and low noise, as well as the analysis of laser diode (LD) operation function and output characteristics, a LD driving control circuit with high speed micro-computer unit ADuc842 as the main control chip is designed. Automatic current control (ACC) and automatic temperature control (ATC) are used in the design to realize constant current source driving and constant temperature control of LD. Protection circuits such as double current-limiting circuit, surge absorbing circuit and low speed starting circuit are adopted in the design so as to improve the anti-interference ability and operation stability. Experimental results show that output current stability error is better than 0.5% and temperature stability error is ±0.1 ℃.