Method for automatically extracting and exporting drawing based on nuclear power unit nine-bit code

The invention relates to the field of nuclear power, in particular to a method for automatically extracting and exporting a drawing based on a nuclear power unit nine-bit code. The method comprises the following steps: S1, determining a standard nine-bit code; s2, judging whether the nine-bit code is correct or not; if so, continuing the step S3; if not, outputting a prompt that the input nine-bit code is wrong; s3, calling a CAD database, and retrieving drawings with the nine-bit codes in the flow chart, the simulated diagram, the logic diagram and the function diagram in sequence; if yes, outputting to a folder with a formulated address; if not, continuing to retrieve in the next image; and if the drawings with the nine-bit codes are not retrieved in the flow chart, the simulated diagram, the logic diagram and the functional diagram, outputting'the drawings without the nine-bit codes'. According to the method, searching can be carried out in the CAD database according to the equipment nine-bit code of the M