The invention relates to a temperature controlled infusion monitoring device and a method thereof, which comprises a hollow cylindrical heating body stacked by a semi-cylindrical heating sheet embedded by two low-voltage heating elements, a transfusion tube passing through the middle is clamped, a temperature sensor is arranged on the inner side of the heating sheet, the temperature sensor is externally connected with a temperature control warning device. When the heating body is electrified, the temperature rises, the liquid medicine flowing in the inner infusion tube of the heating body takes away part of the heat produced by the heating body, which makes the heating temperature maintaining in a setting range, the temperature sensor detects the temperature of the heating body, if the flow of the liquid is slowed or stopped by an accident, or the liquid medicine is exhausted, which leads the temperature of the heating body to rise to the upper limit of the setting temperature range, the temperature warning circuit starts a buzzer to alarm. The temperature controlled infusion monitoring device and the method thereof utilize the heat exchange between the heating body and the flowing liquid medicine to control the temperature of the heating body and monitor the flow condition of the liquid medicine, and at the same time play the role of heating liquid medicine, the principle is unique, the structure is compact, and it is convenient to operate.