The invention discloses an engineering project data processing method and an engineering project data processing system. The processing method comprises the steps as follows: opening a project plan library through a first authentication processor, and importing the data of each project into the project plan library; opening the project plan library through a second authentication processor, reviewing each project according to the weight, and transferring the approved projects with review data to a project reserve library; opening the project reserve library through a third authentication processor, reviewing the feasibility of each project, and transferring the approved projects with review data to a project implementation library; and opening the project implementation library through a fourth authentication processor, and inputting new project data according to the project schedule. The problem that data is scattered and difficult to share due to the fact that engineering project data is operated by multiple units for a long time and engineering project data changes in real time according to the project schedule is solved. Management and control of each phase of an engineering project is realized technically. The engineering project management level of units is improved.