The present invention discloses a real-time snowfall intensity estimation method based on video analysis, which is a real-time snowfall intensity analysis method. The real-time snowfall intensity estimation method includes five parts: region division, single-region snow particle detection, snow particle detection validity judgment, global snow particle estimation and real-time snowfall intensity estimation. Experiments show that by this method, distribution of falling snow particles can be effectively identified and calculation is conducted in real time. It is convenient to combine the method with existing video monitoring systems, therefore achieving high practical values.