Pre-polycondensation liquid level detection device

The utility model provides a pre-polycondensation liquid level detection device, and mainly relates to the technical field of detection devices. A pre-polycondensation liquid level detection device comprises a pre-polycondensation reaction kettle, the pre-polycondensation reaction kettle is provided with a feeding port and a discharging port, a controller is fixedly installed on one side of the pre-polycondensation reaction kettle, and a liquid level sensor is fixedly installed on the upper portion of one side of the inner wall of the pre-polycondensation reaction kettle. A hollow pipe with two sealed sides is integrally and fixedly mounted on one side of the top of the pre-polycondensation reaction kettle, a buoy is fixedly mounted at the lower end of a vertical rod, an alarm is fixedly mounted on the top surface of the hollow pipe, and a proximity switch electrically connected with the alarm is fixedly mounted on the top surface of the inner wall of the hollow pipe; the upper end of the vertical rod is fixe