A portable methane remote sensor based on digital feedback frequency stabilization is developed. Current and temperature dual-feedback strategy suppresses the laser′s long-term wavelength drift; meanwhile it ensures the long-term stability of optical power. Experimental results show that the wavelength drift is less than 1.2 pm in 9 h, and the optical power also remains stable, which ensures the long-term continuous measurement stability of the concentration. Repeatability of concentration measurement value is stable in different detection distances, with a 5% fluctuation. Experimental results indicate that the instrument can be used in practical environment, such as natural gas tube leakage and coal mine.