NOVELTY - A biogas and acetylene compressing method involves purifying marsh gas in configuration solution and calcium hydroxide in a reaction kettle. Biogas from the calcium hydroxide solution and sodium hydroxide solution is made to pass into the reaction kettle to generate calcium carbonate and calcium sulfide and to generate calcium carbonate and sodium sulfide. Acetylene, the calcium carbide and water gas are prepared in the reaction kettle. The marsh gas and cold purified acetylene liquid are compressed in a compressing pipe under high pressure to obtain liquefied gas.    USE - Method for compressing biogas and acetylene to produce artificial liquefied gas.    ADVANTAGE - The method allows preparation of artificial liquefied gas in simple and convenient manner so as to improve application range of the artificial liquefied gas. The method enables effective absorption of carbon dioxide in methane and hydrogen sulfide impurity, improvement of purity and quality of biogas and changing waste into treasure, so that economic benefit of calcium carbonate product is high and methane potential economic value is effectively developed.    DETAILED DESCRIPTION - A biogas and acetylene compressing method involves purifying marsh gas in configuration solution and calcium hydroxide in a reaction kettle. Biogas from the calcium hydroxide solution is made to pass into bottom of the reaction kettle. Biogas flow speed is controlled between 200-240 m3/hour, and pressure in the reaction kettle is controlled between 1.2-1.8 MPa to generate calcium carbonate and calcium sulfide, where mass ratio of the pure calcium hydroxide to carbon dioxide is 1:1.48-1.88. Mixed solution of calcium carbonate and calcium sulfide, purified biogas containing calcium carbonate and calcium sulfide and the purified marsh gas is obtained from top of the reaction kettle. The biogas in the configuration solution and sodium hydroxide is delivered into the reaction kettle. Biogas from the sodium hydroxide solution is made to pass into the bottom of the reaction kettle. The Biogas flow speed is controlled between 200-240 m3/hour and pressure in the reaction kettle is controlled between 1.2-1.8 MPa to generate calcium carbonate and sodium sulfide. Mixed solution of sodium carbonate and sodium sulfide is obtained and biogas containing sodium carbonate and sodium sulfide is obtained from an output and input compression tank after purification. Acetylene, the calcium carbide and water gas are prepared in the reaction kettle. Acetylene and calcium hydroxide mixture is generated. The marsh gas and cold purified acetylene liquid are compressed in a compressing pipe under high pressure at -82.55 degrees C to obtain liquefied gas.