The invention discloses a constructional engineering multi-party collaborative office system, which belongs to the field of engineering management systems, and comprises a construction site supervision unit, an industry market detail unit, a server management unit, a project five-party collaborative unit, a project information management unit and a project quality safety management unit. Multi-party common management is supported on the basis of five-party management; the problems of personnel communication, project management, information sharing, work arrangement implementation, real-time project field monitoring and the like are solved; through cooperative management, personnel, data and management are integrated, the informatization level of project management is improved, the purposeof fine management of constructional engineering is achieved, projects are managed in a multi-party cooperative mode, cross-platform use can be achieved, personnel responsibility setting is clear, data can be stored in a cloud end, calling is convenient, the weight is low, and operation is easy.