NOVELTY - The biogas producing equipment comprises a tub body for storing an organic compound. A flat type up and down motion sieve shaker efficiently mixes the organic compound. A through-hole injects the organic compound into a flat plate surface of the sieve shaker, where the organic compound is mixed according to up and down motion of the sieve shaker. An anaerobic methane digester, an influx unit and an outlet part are connected with the tub body from a top portion to a bottom portion at constant interval. A power source is arranged in an upper part of the tub body for operating sieve shaker.    USE - Used as a biogas producing equipment.    ADVANTAGE - The biogas producing equipment increases the stirring efficiency of the highly concentrated organic compound, so that hydraulic retention time can be effectively reduced in an economical manner without glitch. The microorganism is efficiency contacted with the organic compound using the sieve shaker, thus increasing the methane generation rate.    DETAILED DESCRIPTION - The biogas producing equipment comprises a tub body for storing an organic compound. A flat type up and down motion sieve shaker for efficiently mixing the organic compound. A through-hole injects the organic compound into a flat plate surface of the sieve shaker, where the organic compound is mixed according to up and down motion of the sieve shaker. An anaerobic methane digester, an influx unit and an outlet part are connected with the tub body from a top portion to a bottom portion at constant interval. The microorganism medium is contacted with the organic compound. The biogas producing equipment further includes a power source in an upper part of the tub body for operating sieve shaker, where the sieve shaker naturally descend to a down direction with weight, and the power source lifts the sieve shaker in an upper direction. A guide rod is connected with the sieve shaker to slide the sieve shaker so that the sieve shaker does not lose the balance in the up and down motions. A hemp grating-type connector is installed in an upper side of the sieve shaker, where an upper end of the connector is connected with the power source and a chain.