The invention discloses a prelithiated film and a preparation method and application thereof. The prelithiated film comprises 1um-50um of base film body and 0.02um-100um of prelithated layer coated onthe base film body; the prelithated layer comprises, by weight, 1wt%-99.99wt% of prelithiated material, 0wt%-98.99wt% of coating material, 0.01wt%-10wt% of binder, 0wt%-10wt% of conductive additive material, 0wt%-2wt% of dispersing agent and 0wt%-2wt% of assistant; the prelithiated material is the material capable of releasing lithium ions by an electrochemical reaction under voltage control; theprelithiated material especially comprises LixM1yOz, LixM2y (PO4)z, LixM2y (SiO4)z, Li2S and LixM1ySz; x, y and z are integers or non-integers and meet the balance of electrovalence of chemical formula; M1 is a combination or more of a metallic element, a transition metal element, a rare earth element, an alkali metal, an I VA group element; M2 is a combination or more of the metal element, the transition metal element, the rare earth element, the alkali metal, the I VA group element.