As the working temperature can affect emitting wavelength of distributed feedback(DFB) laser and reduce measurement sensitivity of magnetic field of Spin-Exchange-Relaxation-Free(SERF) atomic magnetometer, a DFB lasers′ temperature controller with high-precision and high stability was designed and developed by using digital proportional-integral-differential(PID) control technology, which is based on TMS320LF2812 core controller. In terms of hardware design, the temperature controller consists of temperature control forward pathway and temperature acquisition backward pathway to form a complete closed-loop temperature control structure. In consideration of software design, the three parameters P, I and D are determined by using Ziegler-Nichols engineering setting method. Using the aforementioned temperature controller, a temperature controlling test was performed on a DFB laser with a center wavelength at 852 nm. Experimental results indicate that, the control scale is 5-60 ℃, the accuracy is ±0.02 ℃, and the control procedure is 20 s. Meanwhile, the stability of working temperature is better than 7.9×10-4(RMS) during long term(220 min) running, which provides performance guarantee for SERF atomic magnetometer in practical application.