The invention provides a fireproofing coating used for engineering machinery and a preparation method of same and relates to the field of coatings. The fireproofing coating includes, by weight, polyurethane elastomer modified polyester resin, a dispersant, a wetting agent, a defoamer, a preservative, calcium carbonate, titanium dioxide, a plasticizer, a thickener, a curing agent, water, ethylene glycol, floating beads, magnesia alumina spinel powder, silicon micro-powder, aluminum silicate, a hindered amine photo-stabilizing agent, and a phosphite antioxidant. The preparation method includes the following steps: 1) weighing the raw materials; and 2) mixing and stirring the raw materials. The fireproofing coating has good fireproofing performance, low production cost and simple production process, is long in service life under normal operation and is not liable to age.