The fiber laser drived by constant current in -40~60 ℃ range can not work normally in complex environments due to the influence of temperature drift of LD pumps and others. A new current source of fiber laser with temperature adaptive adjustment was designed. Driving current can be automatically adjusted by temperature feedback control network and linearly-controlled constant current source,which can maintain the stability of fiber laser output power without adding additional devices such as TEC and deriver. In the measurement of -40~60 ℃,output power fluctuation of fiber laser is ±3%,while output power has the attenuation of about 12.75% before correction.It is beneficial to the miniaturization and lightweight integration of fiber laser and drive.