Flat heat pipe with multiple capillary tissues and manufacturing method of flat heat pipe

The invention discloses a flat heat pipe with multiple capillary structures and a manufacturing method of the flat heat pipe, and belongs to the technical field of heat dissipation devices. Comprising a hollow sealed flat pipe body and a capillary structure arranged in the pipe body. The capillary structures comprise a first capillary structure, a second capillary structure and a third capillary structure; the first capillary structure is a groove, the second capillary structure is a braided copper wire, and the third capillary structure is formed by sintering copper powder; the first capillary structure forms a first layer and is combined with the inner wall of the flat tube body; the second capillary structure and the third capillary structure together form a second layer and wrap the first capillary structure of the first layer; the second capillary structure is embedded in the third capillary structure; and the inner side of the second layer is a steam channel. According to the flat heat pipe with the mul