The utility model provides an urine volume monitoring devices that is used for patient that can not independently urinate, is including the plug of connecting the commercial power, connector assembly power adapter's input, and power adapter output connecting wire's one end, its characterized in that: the alarm is connected to the other end of wire, including the pronunciation chip and the speaker that connect gradually in the alarm, sets up urine in the centre of wire and spreads the sensilla, and urine flows sensor settings and at the middle part that urine is wet, is provided with the electronic scale between plug and power adapter, the urine that is close to of wire spreads the tip of sensilla and sets up the line trap, and the line trap inserts urine and spreads in the direct current socket that the sensilla tip set up, the one end of direct current socket coupling spring, and the polar plate is connected to the other end of spring, alleviates medical personnel's work load, has easy operation, the reliability is high, can play positive effect in the aspect of the monitoring of critical patient's urine volume, and still can reminding the patient to accompany and attend to, in time to change urine wet, and the patient that as far as possible avoids lying in bed presses the sore to take place.