The gas alarm mining lamp in lithium batteries for light source, with lighting and Methane function, apply the workers under the well which have Methane gas to carry convenient. The lights have advantage of small, light, convenient to carry, long using life, high lighting, maintenance-free, safe and less wasting, charging fast, safe and less wasting, etc. As the main light source damage or lighting time outstrip the provision, use another LED auxiliary light source to provide the workers for faint light in well. The auxiliary power source can provide more than 60 hours. This light have lithium battery inside, set a protecting circuit for over-charge, over-discharge, over-heat, extending the battery's using life. The battery inside of the lamp, so the structure to dexterous, convenient to carry, improve work efficiency.