The invention provides a section butt welding method which comprises the following steps of: placing the section and welding a first welding seam for backing; enabling the direction of a welding wire to form an angle of (minus14)-(minus16) degrees and an angle of 14-16 degrees with the longitudinal symmetric surfaces of a groove respectively, and welding a second welding seam and a third welding seam; overturning to form an angle of 2-4 degrees between the direction of the welding wire and the longitudinal symmetric surfaces of the groove, and welding a fourth welding seam and a fifth weldingseam; enabling the direction of the welding wire to form an angle of (minus14)-(minus16) degrees with the longitudinal symmetric surfaces of the groove, and welding a sixth welding seam; enabling thedirection of the welding wire to form an angle of 2-4 degrees with the longitudinal symmetric surfaces of the groove, and welding a seventh welding seam; enabling the direction of the welding wire toform an angle of (minus14)-(minus16) degrees and an angle of 14-16 degrees with the longitudinal symmetric surfaces of a groove respectively, and welding an eighth welding seam and a ninth welding seam; and welding a tenth welding seam between the eighth welding seam and the ninth welding seam. Through the section butt welding method provided by the invention, the welding quality is ensured, and the welding efficiency is improved.