The utility model provides a fish monitoring system based on RFID system, includes remote many antennas read write line and antenna coil, the many PVC nests of tubes become two antenna coil, and the vertical setting of antenna coil, and establish ties between two antenna coil, the 2nd connecting wire sets up at the PVC who forms two antenna coil intraductally, and the 2nd connecting wire both ends all are connected with the antenna resonance ware, and the antenna resonance ware is connected with remote many antennas read write line, still is connected with the computer on remote many antennas read write line. Remote many antennas read write line be connected with the power through a connecting wire. Remote many antennas read write line on still be connected with tuning indicator. Through combining together RFID technique and fish information acquisition, contain PIT mark fish through the monitoring and pass through the coil that the radio -frequency antenna constitutes for monitoring range makes and improves greatly, and the monitoring precision promotes greatly, can reach good monitor effect.