The invention provides a coal-based electric power and chemical product coproduction process capable of realizing zero discharge of CO2. A new coal gasification process which uses CO2 instead of steam as a coal gasification agent is taken as the core; chemical production of chemical products such as methanol, acetic acid and the like, cogeneration by a gas turbine and a steam turbine, and output of CO used as a product are organically combined; and CO2 generated in combustion power generation, steam conversion and other procedures in the coproduction process is separated and enriched, and then is wholly conveyed to a gasifier and used as the coal gasification agent for cyclic utilization, thereby realizing zero discharge of CO2 in the whole process. The process integrally couples different sciences and different industries, solves the key technology that a large amount of greenhouse gas CO2 is discharged in the existing poly-generation process, and achieves the purposes of CO2 recycling and green energy source and chemical industry.