The invention relates to the field of preparation of a capacitor, and in particular relates to a preparation method of a metalized film of an induction cooker capacitor. The preparation method comprises the following steps of: selection and preparation of raw materials, extruding a melt through an extruder, cooling the melt through a chilling roller and an air shower, drawing the melt in a vertical direction, drawing the melt in a transverse direction, testing the thickness of the drawn melt, performing procedures of trimming and corona treatment, rolling, time sequence treatment, slicing, and vacuum-evaporating the metalized film. Through the steps, the prepared metalized film is comparatively high in performance, comparatively low in rejection rate, low in cost and high in current carrying capability.