The ship locks undertake major tasks such as flood control and navigation. Traditional ship lock safety management methods are insufficient in real-time and intuitiveness，and there is an obvious lag in response to danger. So it is difficult to meet the requirements of modern ship lock operation and maintenance management. Based on the concept of the digital twin，this paper proposes to use big data，artificial intelligence，and other technologies to build smart solutions for ship lock safety management. On this basis，a smart ship lock safety management system based on digital twins is developed to improve the smart level of ship lock safety management.