Does the project manager need to sign the salary of the project manager?

Yes As the project manager has the decision-making power and approval power for project management, he needs to manage all the funds involved in the project and supervise and audit the use of project funds to ensure the rationality and responsibility of the use of project funds. However, there may be some special circumstances, such as the resignation and absence of the project manager. At this point, the corresponding obligee in the project organization can sign for confirmation instead of the project manager.