The CAN protocol has been widely used in automotive control, sensor signal transmission, and industrial control due to its high reliability and strong real-time performance. However, in scenarios such as intelligent building retrofitting, mine equipment monitoring, large-scale production line engineering control, and outdoor synchronized construction operations—where large-scale distributed deployment, long-distance transmission, and real-time monitoring of CAN messages are required—traditional CAN communication solutions often fall short due to limited wiring space and the restricted transmission distance of CAN signals. To address this challenge, this paper designs and tests a WiFi-CAN node control module with an AP + STA dual-mode capability. By introducing WiFi signals as relays, a dedicated wireless local area network environment for control nodes is constructed over a large area. In this environment, device deployment is more flexible and convenient, no longer constrained by factors such as cabling and power supply. Through practical testing, the proposed solution meets the requirements for control accuracy and temporal precision.