Invisible hinge

The utility model discloses an invisible hinge which comprises a first hinge plate (1), a second hinge plate (2) and a shaft (3); a first cylinder (1A) is arranged at one side of the first hinge plate (1), a first plane (1C) is arranged at the other side of the first hinge plate (1), and the arm part of the first hinge plate (1) is provided with a V-shaped bend (1B); a second cylinder (2A) is arranged at one side of the second hinge plate (2), and a second plane (2C) is arranged at the other side of the second hinge plate (2); and the shaft (3) can penetrate through a homocentric cylinder composed of the first cylinder (1A) and the second cylinder (2A). The invisible hinge has the advantages that a groove is not required, so that the invisible hinge is convenient to install and solves the problem of irregular cross sections, uneven groove edges and large gaps between the hinge and the grooves which are caused when the groove is arranged.