The invention relates to an engine curing agent, in particular to a multifunctional engine curing agent, and belongs to the technical field of transportation industry. The multifunctional engine curing agent is prepared from the following raw materials in part by weight: 30 to 45 parts of lead-free gasoline, 15 to 35 parts of vinyl acetate, 30 to 50 parts of petroleum ether, 1.0 to 2.5 parts of isoamyl phosphate, 10 to 20 parts of cyclohexanone, 4.0 to 18 parts of calcium naphthenate, 3.0 to 10 parts of naphthalene and 5.0 to 15 parts of camphor. The multifunctional engine curing agent directly attacks a long chain carbon bond of an oil molecule to initiate complete combustion so as to improve heat efficiency, reduce oil consumption and save diesel by about 10 percent. The multifunctional engine curing agent is more economical than usual, particularly under the condition of long-distance high-speed driving. The multifunctional engine curing agent aims at harmful components such as sulfur, colloidal materials and engine accumulated carbon in oil products, improves engine power, promotes combustion to do work, has antioxidant, wear-resistant, cleaning, dispersing, emulsion breaking, corrosion-resistant and lubricating effects, improves clearing of accumulated carbon and colloid of an engine and obviously reduces engine wear so as to reduce the noise of the engine and effectively prolong the service life of the engine.