NOVELTY - A methane fermentor with spherical gas storage tank and its production method comprise 2 parallel gasification boxes having iron frames, middle interlayer water sleeve, outer heat insulating layer, outer protection layer, full-glass vacuum solar heat collection pipe heating device, pipe hot water heating device, electric heating rod heating device, heat insulating water storage tank and spherical gas storage tank. The production method comprises production of 2 parallel gasification boxes; and production of the spherical gas storage tank.    USE - Methane fermentor with spherical gas storage tank and its production method (claimed).    ADVANTAGE - The spherical gas storage tank combined with methane fermentor has large gas storage capacity and long service life.    DETAILED DESCRIPTION - The methane fermentor with spherical gas storage tank and its production method comprise 2 parallel gasification boxes having iron frames, middle interlayer water sleeve, outer heat insulating layer, outer protection layer, full-glass vacuum solar heat collection pipe heating device, pipe hot water heating device, electric heating rod heating device, heat insulating water storage tank and spherical gas storage tank. The production method comprises production of the 2 parallel gasification boxes; production of the outer heat insulating layer; production of the outer protection layer; production of the full-glass vacuum solar heat collection pipe heating device; production of the pipe hot water heating device; production of the electric heating rod heating device; production of the heat insulating water storage tank; and production of the spherical gas storage tank. The spherical gas storage tank is placed in semi-spherical mold and quickly hardens the concrete and sand due to low alkalinity. The alkali-proof glass fiber grid or glass steel synthetic resin and glass fiber fabrics are made into 2 edged semi-spherical outer protection housings with 1:1 ratio. The center of semi-spherical outer protection housing is equipped with hole having 25-30 mm of diameter. The rubber or thickened plastic cloth is made into the spherical liner having same diameter as semi-spherical outer protection housing, where 4 sides on top of liner are equipped with multiple symmetric fixing lugs made from rubber or plastic cloths. The lug is bound with cake-shaped sand bag and center is fixed with plastic marking rod having scale and diameter slight the pressure of methane. The bottom of liner is equipped with pipe having 20-25 mm of diameter and 200 mm of length. The length of plastic marking rod is same as diameter of semi-spherical outer protection housing. The weight of sand bag is determined by pipe. The spherical liner is placed in lower semi-spherical outer protection housing. The marking rod is inserted in center hole of upper semi-spherical outer protection housing. The ventilating nozzle on bottom of liner penetrates out from center hole of lower semi-spherical outer protection housing and is connected with air guiding pipe. The spherical outer protection housing is equipped with bracket whose diameter is less than spherical outer protection housing. The spherical outer protection housing is fixed along the edge drilling screw of the semi-spherical outer protection housing.