The utility model relates to a resistance liquid level monitoring device for the start of a high-voltage motor. In the monitoring device, a resistance liquid level signal transmission device, a resistance liquid level display monitoring device and a resistance liquid level regulating and executing device are connected in sequence. The resistance liquid level monitoring device is mainly characterized in that the resistance liquid level signal transmission device (1) is composed of a resistance liquid level transmitter (4), an insulating guide bar (5) and a pressure sensor (6); and the insulating guide bar (5) is connected with the resistance liquid level transmitter (4) and the pressure sensor (6). The device can safely and reliably isolate high and low voltage electrical systems, and can also display the liquid level of regulated resistance liquid.