NOVELTY - Co-production of coking plant methanol and liquefied natural gas (LNG) comprises passing coke oven gas into gas cabinet, compressing, and carrying out adsorption pretreatment process at variable temperature; conducting hydrodesulfurization and desulfurization to remove organic sulfur and hydrogen sulfide, performing pressure swing adsorption process, then carrying out cryogenic liquefaction process to obtain LNG products, using the generated exhaust gas mainly composed of carbon monoxide and hydrogen as methanol synthesis gas, and mixing with offal coke gas to produce methanol.    USE - The method is useful for co-production of coking plant methanol and LNG (claimed).    ADVANTAGE - The method consumes less energy, and increases coking enterprise economic benefit.    DETAILED DESCRIPTION - Co-production of coking plant methanol and liquefied natural gas (LNG) comprises passing coke oven gas into gas cabinet at 40 degrees C under 0-10 kPa, compressing to 1.05 MPa, and carrying out adsorption pretreatment process at variable temperature; conducting hydrodesulfurization and desulfurization to remove organic sulfur and hydrogen sulfide, performing pressure swing adsorption process under vacuum to remove carbon dioxide, ammonia and benzene and other heavy hydrocarbons, then carrying out cryogenic liquefaction process to obtain LNG products, purifying LNG in cold box, using the generated exhaust gas mainly composed of carbon monoxide and hydrogen as methanol synthesis gas in methanol synthesis compression process, mixing with 7-24 mm offal coke gas by passing tap water to produce methanol; where the with 7-24 mm offal coke gas process includes passing 7-24 mm offal coke, 0.3 MPa steam and enriched atmospheric oxygen having purity of 99.6% into the continuous gas furnace, passing into buffer gas cabinet, carrying out preliminary dedusting desulfurization purification of water gas, then passing compressed air, carrying out wet flue gas desulfurization and deep purification process, passing carbon monoxide and hydrogen in the ratio of 2.10-2.15 as methanol synthesis gas, and compressing to produce methanol.