The invention provides a favorable reservoir boundary automatic pickup method based on a seismic attribute graph. The favorable reservoir boundary automatic pickup method based on the seismic attribute graph comprises the following steps: for a color seismic attribute map input in a bitmap format, performing selective transparent processing on the seismic attribute graph by adopting an accumulation window color filtering technology, and only reserving a user attention area; using a boundary pre-smoothing technology to smooth the boundary of the user attention area; automatically screening a favorable area according to the characteristics of area size, shape, extension direction and the like; and automatically picking up the favorable area boundary by applying a boundary lasso technology. According to the favorable reservoir boundary automatic pickup method based on the seismic attribute graph, a user attention area is automatically extracted, the favorable target area is screened, thefavorable reservoir distribution range is finely depicted by picking up favorable area boundaries, the favorable reservoir development area is accurately calculated, and the working efficiency and theresearch precision of oil-gas exploration researchers are improved.