The invention discloses an automatic pipe feeding device. The automatic pipe feeding device comprises an installing base which is provided with a material box. The material box comprises a bottom plate, a vertical plate arranged opposite to the bottom plate and two side end plates, wherein the bottom plate of the material box is obliquely arranged, a materials outlet is formed in the bottom of the material box, a plurality of material sorting holes are formed in the bottom plate of the material box, the portions, with the material sorting holes, of the installing base are provided with vertically-upward material sorting cylinders, material sorting rods are connected to the ends of piston rods of the material sorting cylinders, the material sorting rods can penetrate into the material box along with the action that the piston rods of the cylinders stretch out, a material conveying groove is formed in the portion, corresponding to the material outlet, of the installing base, a travel-adjustable material pushing hydraulic cylinder used for pushing pipes is arranged at the tail end of the material conveying groove in the installing base, a material partitioning plate is movably arranged on the material outlet of the material box, the material box is provided with a material partitioning cylinder used for driving the material partitioning plate, a material falling plate and a material falling cylinder driving the material falling plate are arranged on the material box and below the material partitioning plate, the material falling plate is parallel with the material partitioning plate, and the material falling plate and the material partitioning plate can slide in the same direction. The automatic pipe feeding device can relieve labor intensity and improve pipe conveying efficiency.