The invention discloses a hybrid electric field measurement system and method for sensitive points under AC/DC hybrid lines. The system comprises a sensor for detecting hybrid electric fields, a communication unit, a data display unit and a grounding plate; the sensor comprises ground reference probes in the X/Y/Z axis directions and ground rotating blades; the communication unit comprises a signal conditioning circuit and a Zigbee communication and ad hoc network unit; the sensor is in wireless communication with the data display unit in a Zigbee manner; and the data display unit is used forreal-time data display and analysis on a power frequency component and a DC component uploaded by the communication unit, as well as automatic calculation and verification on different measurement heights. The system and the method can realize real-time measurement and data analysis on the hybrid electric fields of the AC and DC hybrid lines.