The invention relates to a system and method for the lean management of dosage data of a nuclear power plant. The method comprises the steps that a production management workflow system generates work order task data, and transmits the work order task data to an access control system of the nuclear power plant through a unidirectional transmission module; the access control system of the nuclear power plant judges whether the work order information and worker information collected by an information collection device are valid or not: allowing a worker to enter a control region of the nuclear power plant if the work order information and worker information collected by the information collection device are valid; the access control system of the nuclear power plant records the work information after the worker complete a work order task, and transmits the work information to the production workflow management system through a second unidirectional transmission module. According to the invention, the method achieves the communication between an industrial network and a management network, enables the advantages of the production workflow management system to be applied in the access control system of the nuclear power plant, achieves the fine management of work orders and dosage analysis and statistics, and effectively reduces the conditions that the dosage exceeds a management threshold value.