Online constant value checking method based on pdf protection constant value file

The invention discloses an online constant value checking method based on a pdf protection constant value file, and the method comprises the steps: carrying out the constant value extraction, induction and arrangement of a pdf technical file in a target field, uploading data to a cloud end, and constructing a constant value checking cloud server; performing corresponding scanning on the pdf document which needs to be subjected to constant value checking; carrying out information extraction on the key definite value; uploading the data to a cloud end, and comparing the data in the fixed value check cloud server with the uploaded information; exporting a comparison report, and performing targeted modification on constant value information of the pdf; and perfecting the final pdf document, and secondarily transmitting the modified pdf document into the constant value check cloud server until the comparison result accords with the expectation. According to the method, the redundant workload is greatly reduced, up