The invention discloses a high-capacity rechargeable nickel-metal hydride battery and a manufacturing method thereof, and belongs to the field of batteries. The high-capacity rechargeable nickel-metalhydride battery comprises the following materials of a battery positive plate, a battery negative plate, a positive tab, a negative tab, an electrolyte, an isolating membrane, a steel shell, a cap and a sealing ring. The battery positive plate is a nickel hydroxide positive plate, and the battery negative plate is a hydrogen storage alloy negative plate. The manufacturing method of the nickel-metal hydride battery in the scheme is simple in step and convenient to operate, the overcharge and overdischarge resistance of the battery can be more effectively improved in the overcharge and overdischarge reaction process, the use safety performance of the battery is greatly improved due to the excellent overcharge and overdischarge resistance, and the problems that a nickel-metal hydride batterymanufacturing process in an existing nickel-metal hydride battery manufacturing technology is very troublesome, so that the nickel-metal hydride battery production efficiency is lower and the safetyperformance is lower, is solved.