The invention provides a flat plate
heat pipe. The flat plate
heat pipe comprises an
evaporation cover plate, a condensation cover plate, a liquid filling
pipe and liquid absorption cores. The
evaporation cover plate is of a concave table structure. A connection belt is arranged around the periphery of the top end of the concave table structure of the
evaporation cover plate. The liquid absorption cores of a porous capillary structure are formed in the periphery of the inner side of the top end of the concave table structure of the evaporation cover plate, and a hydrophilic
thin layer is compounded to the bottom face of the inner side of the top end of the concave table structure of the evaporation cover plate. A plurality of convex plates are arranged on the side, in contact with the evaporation cover plate, of the condensation cover plate. A hydrophobic
thin layer is compounded to the positions, except for the positions with the convex tables, of the side, in contact with the evaporation cover plate, of the condensation cover plate. A through hole is formed in the outer side of the evaporation cover plate, and the liquid filling
pipe is arranged in the through hole. The evaporation cover plate and the condensation cover plate are connected in a sealed mode to form a
closed cavity. Through modification of the hydrophilic property of the evaporation cover plate of the flat plat
heat pipe and the hydrophobic property of the condensation cover plate, and through the supporting convex plates machined on the condensation cover plate, the heat exchange capacity and stability of the flat plate heat
pipe are improved.