The digital transformation in the design of modern power plants is a prevailing trend, with numerous design entities pursuing fundamental digital design and delivery as their ultimate goal. Given the vast scale, intricate professional structures, and stringent quality assurance and control demands of modern power plants engineering projects, the clarity and traceability of each design process are paramount. Traditional collaborative design methods, which rely on various informational documents for inter-professional and inter-trade coordination, have been rendered inadequate for the structured storage and utilization of engineering data. This paper introduces a novel approach to design collaboration in modern power plants engineering, harnessing digital signature and markup language technologies to facilitate structured access to design interface information, there by enhancing design quality control. Furthermore, by incorporating blockchain-inspired concepts, the proposed method alleviates the burden of document management, enabling design professionals to concentrate on the substantive content of the materials.