The invention discloses a multi-stage signature method for an electronic document on the basis of workflow. The multi-stage signature method comprises the following steps: 1) collecting and encrypting an electronic signature; 2) carrying out loose coupling with the workflow to manufacture an electronic signature template; 3) compiling and submitting a document by a user; 4) shielding difference among different types of documents through verifying document formats; 5) obtaining and encrypting the electronic signature; and 6) writing the electronic signature into the documents. The invention provides the lightweight and automatic multi-stage signature method for electronic document, and the signature method carries out the loose coupling with the workflow, comprises user identity authentication, shields the difference among different types of documents, does not need to install a plugin and has the advantages of encrypted signature process and lower cost.