The invention relates to the field of lubricating liquid, in particular to lubricating liquid for food transporting equipment. The lubricating liquid is prepared from the following raw materials in parts by weight: 2-3 parts of water-soluble
chitosan, 2-3 parts of
triethanolamine citrate, 0.5-1 part of
polyvinylpyrrolidone, 10-14 parts of
mint extract, 8-14 parts of
carboxylic acid, 2-4 parts of polyalkylene glycol, 3-5 parts of
sodium octadecyl
polyoxyethylene ether phosphate, 0.3-0.5 part of medical
rust, 2-3 parts of a
silicone defoamer, 1-2 parts of ethoxylated
pentaerythritol tetra (methyl)
acrylate, 1-2 parts of
ethylparaben, 4-8 parts of
sedoheptulose 7-
phosphoric acid, and 20-26 parts of
simethicone. The lubricating liquid disclosed by the invention is free from toxins, difficult to volatilize, and high in
specific heat capacity, has certain heat-conducting properties for heat produced by equipment abrasion, has certain attraction capacity on
bacteria and pests, has excellent capacity of killing the
bacteria and the pests, has quite significant antirust capacity, and does not have
crystal deposition, and the kinematic
viscosity of the lubricating liquid is 10-20% higher than that of general lubricating liquid.