The invention discloses a method for reducing the early-warning false alarm rate of forest fire and belongs to the field of computer vision. The method mainly comprises two parts, wherein one part is constructed for eliminating the context of picture semantics in a false alarm and the other part is constructed for eliminating the false early-warning information. In the above first part, a panoramic pixel information database Dp of a monitoring area and an image scene semantic database Ds of the monitoring area are established. According to the technical scheme of the invention, false alarms can be well eliminated. Therefore, the false alarm rate of the system is effectively reduced. Meanwhile, the accuracy of the fire early-warning is greatly improved.