Engineering machinery lubricating grease and preparation method thereof

The invention discloses engineering machinery lubricating grease and a preparation method thereof, and belongs to the field of engineering machinery lubricating grease. The invention provides a lubricating grease, which comprises the following components: 71-93 parts of base oil; 5-15 parts of fatty acid; 1-5 parts of oil-soluble alkali liquor; 0.05-0.5 part of an antioxidant; 0.05-2 parts of a structure improver; 0.05-6 parts of an extreme pressure anti-wear agent; and 0.05-0.5 part of an antirust agent. The preparation method of the lubricating grease comprises the following steps: S1, adding fatty acid into the base oil, performing mixing, adding the oil-soluble alkali liquor, and performing heating; S2, heating the mixture to 200-210DEG C, and keeping the temperature for 2-5min; S3, transferring the mixture to an intermediate kettle, adding the base oil into the intermediate kettle, carrying out circulating dispersion and cooling to 70-90DEG C; and S4, adding the antioxidant, the antirust agent, the extre