Abstract: The determination of double carbon\" puts forward some new requirements of green and low carbon for the development concept of coal and gas co-mining. Based on the characteristics of China`s coal-based energy endowment, aiming at the technical problems of CH4-CO2 double carbon emission reduction in coal mines, this study investigates the key technical problems such as the efficient and accurate extraction of coal mine gas, the cascade utilization of coal mine gas with full concentration and CO2 capture-storage-utilization in coal seams. Therefore,the study puts forward the conception of the whole life cycle gas simultaneous mining technological system with near zero emission of CH4-CO2 in coal mines as the core, expounds the conception system from two aspects of low-carbon fusion technology and negative carbon technology and analyzes the corresponding carbon source and sink mechanism relationship. Efficient and accurate gas extraction in coal mine covers the in-situ measurement of gas content in deep hole, the accurate prediction of gas emission, the accurate identification of gas extraction area, the accurate construction design of gas extraction, the accurate anti-reflection of gas extraction and the accurate regulation of gas extraction. In the step-by-step utilization of coal mine gas with full concentration, a step-by-step comprehensive utilization system based on the direct utilization of high-concentration gas, the concentration enhancement and efficiency enhancement technology of ventilation gas and low-concentration gas is put forward. As a typical negative carbon emission technology, the CO2 storage in coal seam has been in the commercial operation stage. The authors focus on the core of near-zero carbon emission in coal mine gas, and put forward the concept of carbon sequestration in the goaf of CO2 coal mine and vegetation. Finally, the development direction of CH4-CO2 collaborative emission reduction technology system in the coal mine under the dual-carbon target is expounded including ① the deep integration technology of geological transparency-extraction intelligence\" and gas accurate extraction; ② the gas enrichment-enrichment-utilization integrated technology and equipment; ③ the global negative carbon emission technology of CCUS+ecological carbon sink\";④ the dynamic monitoring and control technology system of CH4-CO2 in coal mine in the whole life cycle. Through the gradual implementation of the concept above, the aim is to provide some new development ideas for the realization of carbon neutrality in the China`s coal industry.