If it's for Confluence server platform, then OneNote file format is not available for importing directly into Confluence, you would have to export to Doc or Pdf to be able to import, there is a feature request for that https://jira.atlassian.com/browse/CONFSERVER-30883
If you just want to be able to edit documents as attachments on Confluence pages, then starting with version 6.11, we have a new "edit with" function that allows to edit attachments with local applications via companion app, see here for more info https://confluence.atlassian.com/doc/edit-files-170494553.html
For cloud users, Confluence allows importing word documents.
However, importing from OneNote is not supported. We have developed add-on which solves this problem: MS OneNote Importer for Confluence
Give it a try and let us know if you face any issues.
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