The invention provides a door opening supporting mechanism which is used for supporting a cover plate when the cover plate is opened relative to a chassis. The door opening supporting mechanism comprises a supporting part. The supporting part comprises a limiting plate and a supporting plate, wherein the included angle between the limiting plate and the supporting plate is from 90 degrees to 180 degrees. At least one group of limiting structure is arranged on the limiting plate. Each group of limiting structure comprises a first limiting groove and a second limiting groove. A limiting column corresponding to each group of limiting structure is arranged on the cover plate. An extending frame is arranged at a position corresponding to the supporting part on the chassis. When the limiting column matches a first limiting groove, the supporting plate abuts against the extending frame, and the cover plate is always open. When the limiting column matches a second limiting groove, the supporting plate is away from the extending frame. The door opening supporting mechanism provided by the invention can conveniently support the cover plate through the supporting part, and has the advantages of simple structure, easy operation and convenient use.