NOVELTY - An ecological and environment-friendly water-retention nutrition bowl is produced by adding an ecological and environment-friendly water-retention nutrition lake sludge into a double horizontal shaft forced mixer, adding a biogas slurry water-retention agent, and homogenizing; and press-forming into a semi-finished products for 28 days, and installing a drain hole on its bottom part.    USE - Method of producing ecological and environment-friendly water-retention nutrition bowl.    ADVANTAGE - The method is environment-friendly, has low carbon content, and can retain water for 45 days.    DETAILED DESCRIPTION - An ecological and environment-friendly water-retention nutrition bowl (2) is produced by:    (A) adding an ecological and environment-friendly water-retention nutrition lake sludge (55-85 wt.%) into a double horizontal shaft forced mixer, adding a biogas slurry water-retention agent (15-45 wt.%), and homogenizing; and    (B) press-forming into a semi-finished products for 28 days, and installing a drain hole on its bottom part.    The ecological and environment-friendly water-retention nutrition lake sludge comprises water-retention nutrition soil (3) comprising (wt.%) dry basis lake sludge (35-60), fermented poultry excrement (2-15), edible fungi residue (2-10), methane residue (2-10), edible fungi carbonized residue (1-10), hyperviscous attapulgite clay powder (1-10), bentonite powder (1-10), microelements mixture (0.01-0.2), and cement (2-20). The microelements mixture comprises (wt.%) ferrous sulfate (0.01-25), zinc sulfate (0.01-25), ammonium molybdate (0.01-20), copper sulfate (0.01-20), borax (0.01-20), and manganese sulfate (0.01-20). The biogas slurry water-retention agent comprises (pts. wt.) biogas slurry (95-99.5), and water absorption resin (0.5-5). The biogas slurry water-retention agent is prepared by mixing biogas slurry and water absorption resin, and solidifying the mixture for 10-60 minutes.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic view of a method of producing ecological and environment-friendly water-retention nutrition bowl.    Groove (1)    Ecological and environment-friendly water-retention nutrition bowl (2)    Water-retention nutrition soil (3)    Water discharging hole (4)