In order to ensure the anchoring effect of anchor cable in foundation pit and slope projects, and ensure the stability and safety of the project, this paper studies the design and implementation of an adaptive intelligent compensation system of anchor cable based on multimodal perception, relying on artificial intelligence (AI). This paper first discusses the design of multi-modal perception fusion monitoring, AI intelligent decision-making, loss prediction, IOT remote monitoring platform, adaptive closed-loop control, and so on. This paper analyzes the hardware system, AI model algorithm, IOT cloud platform, and app, system integration, and closed-loop control. The authors hope that this paper can provide a scientific reference for the subsequent application and optimization of the system.