The invention discloses a liquid nitrogen pump device capable of outputting liquid nitrogen in a pressure-stabilized mode. The liquid nitrogen pump device comprises a sealed container, the sealed container is provided with a liquid nitrogen flowing-out pipe and a resistance wire, the liquid nitrogen flowing-out pipe is provided with a safety valve, a check valve and a pressure-limiting valve, and the resistance wire is connected to a heating circuit. According to the liquid nitrogen pump device capable of outputting the liquid nitrogen in the pressure-stabilized mode, the liquid nitrogen in the sealed container can be partially heated through the heating circuit, pressure in a liquid nitrogen pump is increased after the liquid nitrogen is gasified, the gasified liquid nitrogen pump is transferred to a liquid nitrogen experiment device from the liquid nitrogen pump through the liquid nitrogen flowing-out pipe, the liquid nitrogen pump does not need to be turned on in the whole operation process, the operation is convenient and fast, the liquid nitrogen can flow out in the pressure-stabilized mode, moisture is prevented from being guided into the liquid nitrogen, and the accidental cold injury caused by taking out the liquid nitrogen manually is avoided.