A thin-film capacitor for an electric vehicle, comprising: a casing, a plurality of capacitor cores, an anode busbar, a cathode busbar, a first electrode terminal connected to the anode busbar, a second electrode terminal connected to the cathode busbar, a first connection sheet, a second connection sheet, a first battery connection sheet, a second battery connection sheet, a first battery connection terminal and a second battery connection terminal, wherein the plurality of capacitor cores, the anode busbar, the cathode busbar, the first connection sheet, the second connection sheet, the first battery connection sheet, the second battery connection sheet are disposed within the casing; the anode busbar and the cathode busbar are superposed together and an insulation sheet is provided between the anode busbar and the cathode busbar; the first connection sheet and the second connection sheet are opposed to each other and the capacitor core is disposed between the first connection sheet and the second connection sheet, the first connection sheet is connected to the anode busbar and provided with a first connection terminal connected to the capacitor core, the second connection sheet is connected to the cathode busbar and provided with a second connection terminal connected to the capacitor core; the first battery connection sheet is connected to the anode busbar and adjacent to an end of the anode busbar, the second battery connection sheet is connected to the cathode busbar and adjacent to the first battery connection sheet, the first battery connection terminal is connected to the first battery connection sheet, the second battery connection terminal is connected to the second battery connection sheet, an axis of one of the plurality of the capacitor cores is arranged to be perpendicular to the anode busbar and the cathode busbar and two ends of the one of the plurality of the capacitor cores are connected to the first battery connection sheet and the second battery connection sheet respectively, axes of rest ones of the plurality of the capacitor cores are arranged to be parallel to the anode busbar and the cathode busbar, characterized in that the plurality of capacitor cores, the anode busbar, the cathode busbar, the first connection sheet, the second connection sheet, the first battery connection sheet, the second battery connection sheet are sealed by potting insulators, and the first battery connection sheet comprises a first plate limb and a second plate limb connected to the first plate limb with a predetermined angle, the first plate limb is extended from an edge of the anode busbar, the second plate limb is opposed to the anode busbar, the second battery connection sheet comprises a first sheet portion and a second sheet portion, the first sheet portion is extended from an edge of the cathode bus and opposed the first plate limb, wherein the second sheet portion comprises a first sheet limb and a second sheet limb connected to the first sheet limb with a predetermined angle, a free edge of the first sheet portion is connected to an outer surface of the first sheet limb, a portion of the second plate limb is opposed to a portion of the first sheet limb and an insulation layer is provided between the portions, the first battery connection terminal is connected to the second plate limb, and the second battery connection terminal is connected to the second sheet portion.