With the development of new technologies such as cloud computing, big data, and artificial intelligence, the deep integration of next-generation digital technology with the production, operation, and service of modern power plants has brought significant opportunities and challenges to cost control of modern power plants. This article summarizes the shortcomings of traditional cost control models and combines them with the requirements of modern power plant cost control under the new situation. By comprehensively utilizing technologies such as 5G, intelligence, Internet of Things, big data, and cloud computing, based on a four layer structure of perception layer, network layer, platform layer, and application layer, a cost control model under the digital background is proposed, which relies on digital technology and data resources for digital management, Thus comprehensively improving the level of cost control in modern power plants, achieving efficient, accurate, and sustainable project management and operation.