NOVELTY - Production of chemical products from petroleum, coal, natural gas and salt electrolysis solution is carried out by sending petroleum into a raw material distillation sub-system, separating out part of light oil product, decomposing and cracking heavy oil product, and discharging light component in form of liquid oil; sending raw coal and petroleum coke into wet gasification unit to prepare into slurry and contacting with oxygen to generate hydrogen gas and inert component solid residue; converting natural gas to form methane; and converting salt electrolysis solution to form sodium carbonate.    USE - Method for producing chemical products from petroleum, coal, natural gas and salt electrolysis solution (claimed).    ADVANTAGE - The method can save nonrenewable resources and prevent environmental pollution.    DETAILED DESCRIPTION - Production of chemical products from petroleum, coal, natural gas and salt electrolysis solution comprises sending petroleum into a raw material distillation sub-system of an oil refining unit, separating out part of light oil product and discharging other parts from distillation sub-system to enter into a coking/cracking sub-system, decomposing and cracking heavy oil product in coking/cracking sub-system, discharging light component in form of liquid oil product to enter into a hydrorefining system together with the light oil product generated by the raw material distillation sub-system to hydro-refine with hydrogen generated by a component separating unit. The heavy component in the coking/cracking sub-system is discharged from the oil refining unit in solid form to enter into a wet gasification unit as raw material of the wet gasification unit. The oil refining unit is provided with an organic matter-containing wastewater wet gasification unit for recycling and reusing of wastewater for pulping. Raw coal or coal conversion solid carbon-enriched product low temperature pyrolysis semi-coke, coal liquefied residue, and petroleum coke generated in the first step are processed by sending into wet gasification unit to prepare into slurry by mixing with organic wastewater, adding auxiliary agent, and then contacting with oxygen in gasification and purification subsystem to generate carbon monoxide (CO) and hydrogen gas and an inert component solid residue. The natural gas is processed by entering pressurized natural gas into a gas conversion unit and contacting with oxygen or steam to form methane, hydrogen and CO, removing carbon dioxide and sulfur-containing gas to be sent to a carbon recycling unit and sulfur recovery unit to form inorganic sulfide or solid elemental sulfur. The salt electrolysis solution is processed by sending salt solution into a salt electrolysis conversion unit to form solution containing chlorine and sodium hydroxide, adding sodium hydroxide solution and separating out carbon dioxide to obtain sodium carbonate.