Emergency shutdown method and system for nuclear fuel reprocessing plant and nuclear fuel reprocessing plant

The invention discloses an emergency shutdown method for a nuclear fuel reprocessing plant, which comprises the following steps of: firstly, acquiring monitoring data of equipment and judging whether the equipment enters an accident state according to the monitoring data: if the equipment enters the accident state, judging whether a current running redundant safety-level equipment sequence is consistent with a current operation unit sequence of a safety-level system; when the redundant security level equipment sequence is inconsistent with the current operation unit sequence, the running redundant security level equipment sequence is switched to be consistent with the current operation unit sequence; and then the safety-level system is used for controlling the nuclear fuel reprocessing plant to stop. The emergency parking method for the nuclear fuel reprocessing plant is clear and reasonable in thought, convenient to execute, specially arranged for the reprocessing plant, capable of parking in time and capabl