Abstract: In response to the current limitations in calibrating power quality analyzers, which typically require sending equipment to professional institutions for metrological traceability—a process that is not only time-consuming and labor-intensive but also fails to evaluate measurement performance under actual operating conditions—we have developed a remote online calibration platform for power quality analyzers. This innovative platform integrates network technology, measurement technology, and communication technology, leveraging the Internet of Things, cloud services, and encryption techniques to establish a comprehensive remote calibration process. The system enables real-time control of standard instruments and devices under calibration, facilitates automatic data collection and processing, and generates calibration certificates autonomously. With this platform, users anywhere can simply power on the standard instrument and the device under calibration, connect the necessary data cables and network, allowing superior metrological technical institutions to remotely conduct the entire calibration process, ensuring full control and oversight throughout. Experimental tests have demonstrated that this remote online calibration platform offers high calibration accuracy and user-friendly operation, presenting broad application prospects in the field of power quality measurement and smart grid technologies.