The invention belongs to the technical field of power batteries, and especially relates to a power battery top cover and a power battery using the top cover. The power battery top cover comprises a top cover sheet, and a firs pole pillar, a second pole pillar, a pressure release valve, a liquid injection hole, pneumatic overturning sheets and a resistor block, the first pole pillar is in insulation connection with the top cover sheet, the second pole pillar is electrically connected with the top cover sheet through the resistor block, the pneumatic overturning sheets are electrically connected with the top cover sheet, the conductive block is arranged above the pneumatic overturning sheets, a baffle plate is arranged under the pressure release valve, the pneumatic overturning sheets comprise a first pneumatic overturning sheet and a second pneumatic overturning sheet, and the thickness of the first pneumatic overturning sheet is smaller than the thickness of the second pneumatic overturning sheet; and when the pressure in the power battery increases, the pneumatic overturning sheet and the second pneumatic overturning sheet sequentially move upward in order to electrically connect the first pole pillar with the second pole pillar. Compared with power battery top covers in the prior art, the power battery top cover disclosed in the invention makes the power battery have an excellent safety protection function in overcharging, nailing, short circuit and hot box test.