The invention relates to a range hood operation state detection and maintenance prompt method. The range hood operation state detection and maintenance prompt method is characterized in that a hook support is fixed on a wall surface of a range hood, a hook is arranged on the upper part of the back of the range hood, the hook on the back of the range hood is hung on the hook support, and a pressuresensor which can abut against the wall surface is arranged at the lower part of the back of the range hood. The range hood operation state detection and maintenance prompt method comprises the following steps that after the range hood is started to work, a pressure value of the pressure sensor is detected in real time, then the real-time pressure value detected by the pressure sensor is comparedwith a pressure reference value detected by the pressure sensor in a lampblack-free state, and when the detected real-time pressure value is smaller than the pressure reference value or is rapidly reduced or even reaches zero, an alarm signal is sent out; when the detected real-time pressure value is increased but less than a first preset pressure threshold value, the range hood is judged to worknormally; and when the detected real-time pressure value is larger than or equal to the first preset pressure threshold value, a reminding signal is sent out. The range hood operation state detectionand maintenance prompt method has the advantages that the reliability is higher and more accurate.