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The DFB Laser is very sensitive to the ambient temperature. In order to reduce the influence if the ambient temperature and the change of the pump heating temperature on the output of the laser, a power adjustable DFB laser supply with dual circuit TEC temperature control is proposed. The power supply takes STM32 as the control core, studies the two way temperature acquisition and control in crystal and Laser, and makes the laser working temperature constant. The power of DFB laser is continuously regulated by voltage controlled constant current source. The test results show that the driving power has the advantages of small volume, high current accuracy, good temperature stability and wide application prospect compared with the traditional way.