The invention discloses a manufacturing method of a through hole, comprises the steps of providing a base material, wherein the base material comprises a first surface and a second surface arranged opposite to the first surface; providing a jig, and arranging the jig at the side, which is away from the second surface, of the first surface in a spacing mode; and cutting the base material in the direction from the second surface to the first surface through a focused laser beam, reflecting the laser beam by the jig after the laser beam penetrates through the base material so as to cut the base material in the direction from the first surface to the second surface, and forming an X-shaped through hole, wherein the hole diameter of the through hole is gradually decreased from the first surfaceand the second surface to the interior of the base material.