In order to actively respond to global climate change, China has set a "carbon peaking by 2030 and carbon neutrality by 2060" goal. The energy structure of China decides that coal is the main consumption energy, and the situation can not be changed in the short term. In order to achieve the goal of carbon peaking and carbon neutrality, the coal industry needs to innovate from both technical and theoretical aspects. Therefore,  based on the idea of underground coal gasification, and three ways of deep coal fluidization production were summarized, namely gasification, pyrolysis and biological dissolution. Among them,  the coal underground gasification technology was mainly reviewed, including the development history, gasification process and factors affecting the stability of some typical coal underground gasification projects at home and abroad, and the reasons why the coal underground gasification technology has not formed industrial production were briefly analyzed. In addition, the injection and production technology between multistage fractured horizontal well and well seam in petroleum industry is introduced into deep underground coal fluidization mining. The deep underground coal fluidization mining was realized by injecting gasifier and adding heating device. Based on the injection and production technology between horizontal wells, the application prospect and scope of a new well type in underground coal gasification, underground pyrolysis and underground bio-dissolution mining were discussed. Compared with the traditional underground gasification process, the injection and production technology between horizontal well and well seam has the advantages of saving mining costs, improving economic benefits, enlarging gasification reaction area and improving the spread range. In addition, the new energy technology can also be used to generate electricity and heat, which can reduce carbon emissions to a certain extent and promote the realization of the national "double carbon" goal. Finally, combined with the current situation of deep coal fluidization development, the existing problems were analyzed and some suggestions were put forward for the future development of deep coal underground gasification industry.