The invention provides an improved nickel-hydrogen battery. The improved nickel-hydrogen battery comprises a shell, a positive pole plate, a negative pole plate and a separator, wherein the positive pole plate, the separator and the negative pole plate are sequentially laminated and wound to form a battery cell from inside to outside, the separator comprises an inner-circle separator and an outer-circle separator which are arranged in parallel, the inner-circle separator is a grafting separator, the outer inner-circle separator is a sulfonate separator, the inner-circle separator is adjacent to one side of the positive pole plate, the outer-circle separator is adjacent to one side of the negative pole plate, press sheets are adjacent to sides, opposite to each other, of the inner-circle separator and the outer-circle separator, and the two opposite press sheets are fixedly connected with each other. The grafting separator is used as the inner-circle separator, and the high-power discharging performance and the charge retention capability of the battery are improved by means of high-rate discharging performance of the grafting separator; and the sulfonate separator is used as the outer-circle separator, the breakage rate of the separator is reduced by means of excellent compactness, elongation and puncturing-resistant capability of the sulfonate separator, and the short-circuitprobability of the battery is reduced. The improved nickel-hydrogen battery is simple in structure and is convenient to use, the discharging performance of the battery can be effectively improved, andthe service lifetime of the discharging performance can be effectively prolonged.