The invention discloses a forestry fire prevention intelligent inspection monitoring and early warning system based on big data. The system comprises an inspection area division module, an unmanned aerial vehicle, an unmanned aerial vehicle inspection route matching module, a database, a plant height acquisition module, an inspection height adjustment module, a fire hazard inspection parameter acquisition and analysis module, a GPS positioning module, a distance navigation module, a central monitoring platform and an early warning module.According to the invention, the forest area is divided;the unmanned aerial vehicle is used for replacing manual inspection, infrared thermal imaging shooting is carried out on the inspection subareas in the inspection process to count fire points with fire risks, meanwhile, flames and visible smoke phenomena of all the inspection subareas are monitored, intelligent inspection monitoring can be carried out on forest fires, the inspection efficiency ishigh, The forestry fire prevention intelligent inspection monitoring and early warning system has the advantages of being high in monitoring speed, high in timeliness and high in accuracy, meanwhile,the fire point position is positioned, the positioned geographical position is sent to forest protection personnel, the forest protection personnel go to extinguish a fire, and therefore damage to forest resources is reduced.