The power system adopts transparent encryption technology to protect the operation data of power dispatching. With the construction of new power systems, the scale of power dispatch operation data is gradually expanding. However, the current transparent encryption and decryption capabilities of databases are limited, resulting in performance bottlenecks in high concurrency scenarios. To address this, we propose a dynamic thread pool-based transparent encryption and decryption mechanism for high-concurrency power dispatch operation data. This mechanism can automatically scale the number of threads up or down based on encryption and decryption request load, ensuring efficient resource utilization. Experimental results show that this mechanism significantly enhances the response speed and throughput of encryption and decryption operations in high-concurrency scenarios.