The invention discloses a three-layer co-extruded high-heat-preservation light-conversion PO film, and belongs to the field of agricultural greenhouse films. According to the invention, on the basis of a previous product, ethylene-vinyl acetate copolymer (EVA) is added into metallocene polyethylene (mPE), a light-conversion master batch is added into a middle layer, the formulas of an outer layer,the middle layer and an inner layer are different, the formulas of the outer layer, the middle layer and the inner layer are mixed uniformly respectively, master batches are prepared by using a two-thread worm double-screw extruder, a three-layer film extrusion is formed through a co-extrusion die head to prepare a PO agricultural greenhouse film, and water-based dripping fog-eliminating coatingliquid is coated outside the PO film. The film is anti-aging and free of fog drops, and excellent in puncture resistance and has a service life of 3 years or more. After inspection and testing by an authoritative department, all quality and technical indexes reach or exceed a national standard, some of which are more than twice as good as the national standard. The PO film is good in light-conversion effect, has a light conversion rate reaching 13% or more, is very beneficial to the growth of crops and shortens the growth period of the crops at the same time.