The invention discloses a radial gradually-wide type fin-structure grooved panel heat pipe and a processing method thereof. The radial gradually-wide type fin-structure grooved panel heat pipe comprises a lower base, an upper cover plate and a support ring, wherein the lower base comprises a circular substrate, the circular substrate is provided with a circular lug boss, the top surface of the circular lug boss forms an inclined surface of an inner taper structure with a low center and a high outer edge, V-shaped grooves and ridges are radially distributed on the top surface of the circular lug boss from the center to the outer edge, and the support ring is arranged in the center of the top surface of the circular lug boss; one surface of the support ring contacting with the ridges is a plane, and the surface of the support ring contacting with the upper cover plate is a concave-convex contact surface; a capillary wick is arranged in the center of the top surface of the circular lug boss, and the widths and the depths of the V-shaped grooves are gradually increased from the center to the outer edge of the circular lug boss. According to the structure, capillary action is intensified, and therefore, the capillary limit of the radial gradually-wide type fin-structure grooved panel heat pipe is greatly enhanced, larger capillary force is provided and the superficial area of boiling heat transfer is enlarged; and in addition, the invention has the advantages of simpleness, convenience and easy operation for technical means, low cost and wide application prospect.