The embodiment of the invention discloses a target area detection method, device and terminal, and a storage medium and belongs to the technical field of computers. The method comprises the followingsteps: determining a plurality of sample regions and classification results; acquiring a classifier, wherein the classifier comprises a plurality of classification nodes arranged in sequence; traininga first classification node in the classifier according to a plurality of sample regions and a classification result of a plurality of sample regions; continuing to train the next classification nodeafter the first classification node is trained until the multiple classification nodes are all trained; when it is determined that the currently tracked image does not contain a target region, usingthe trained classifier to classify at least one region in a second image after the currently tracked image; determining a target region in the second image according to the classification result, without the need of detecting each image, thereby reducing unnecessary calculation amount, improving the accuracy of the classifier and further improving the accuracy of the target region.