Efficient data annotation method

The invention belongs to the technical field of text data annotation, and particularly relates to an efficient data annotation method which comprises the following specific annotation steps: S1, transmitting an image to be annotated to a data annotation platform, so that an annotation system processes the image to be annotated and annotates the image to be annotated by annotation personnel; s2, performing projection transformation on the image to enable the shape of a marked target to be close to a rectangle; s3, labeling by using a rectangular labeling method; s4, performing coordinate inverse transformation; s5, obtaining corresponding annotation information of the original image, outputting the coordinates of the corresponding positions on the original image after inverse transformationin the step S4. Under the condition that a single image sample contains a large number of to-be-annotated targets in the same direction (form) (for example, a bill sample contains a large number of textboxes in the same angl