The invention discloses a reinforcement detailing-modularized machining system based on BIM (Building Information Modeling) technology, which comprises a structural model data design module, a reinforcement structure design data importing model, a BIM model management module, a reinforcement model encoding module, a modularized machining model data exporting module, a numerically controlled machine tool model information identification module, a modularized reinforcement production and machining module and an information management platform; and the reinforcement structure design data importing model, the BIM model management module, the reinforcement model encoding module, the modularized machining model data exporting module, the numerically controlled machine tool model information identification module and the modularized reinforcement production and machining module can all carry out peer-to-peer data transmission with the information management platform. A method disclosed by the invention can realize the whole-life-cycle information flow management of reinforcement production, and compared with conventional processes, the method greatly shortens the construction period, reduces the cost, greatly increases the production efficiency, and reduces errors caused by human intervention.