Method for forming multiple fractures by forced planar diverting of fracture opening being temporarily plugged

The invention provides a method for forming multiple fractures by forced planar diverting of a fracture opening being temporarily plugged. The method includes: allowing temporary plugging diverting material fluid to a position near the fracture opening in a reservoir so as to form a bridge plug and force the fracture to divert, forming multiple fractures, activating micro-fractures of the reservoir with active liquid or acid liquid, and forming a multi-fracture mesh. The method according to the technical scheme has the advantages that artificial fractures in unconventional oil-gas reservoirs, such as low-permeability and ultralow-permeability oil-gas reservoirs, tight oil reservoirs and shale oil-gas reservoirs, are forced to divert in the plane, forming multiple artificial fractures having guiding ability, chances to connect reservoir bodies are increased, drainage area is enlarged, cleaning diverting material is of degradability and can fully degrade after construction, all the fractures can be utilized, and yield increase is more obvious.