The utility model relates to a monitoring device for a liquid conveying pipeline. A pressure transmitter is connected with a pressure display controller through a cable, a temperature transmitter is connected with a temperature display controller through a cable, and a flow transmitter is connected with a flow display controller through a cable. The output ends of the pressure transmitter, the temperature transmitter and the flow transmitter are respectively connected with a relay, an alarm bell and a computer host, and the working conditions of an oil conveying pipeline can be monitored through pressure, temperature, and flow. The utility model has the advantages of high sensitivity and high accuracy. If the oil conveying pipeline is abnormal, the utility model can alarm accurately, and the problem is solved in time. The utility model is especially suitable for the monitoring of the oil stolen condition for the oil conveying pipeline, the condition can be discovered in time, and staffs can get to the field in time.