The invention discloses a double heat source synchronous wire feeding and powder feeding welding method. The double heat source synchronous wire feeding and powder feeding welding method uses a welding system composed of a wire feeding device, a front heat source, a rear heat source, a powder feeding device and a gas protection device, wherein a wire feeding spearhead, the front heat source, the rear heat source and a powder feeding nozzle are arranged in series in the welding direction, the wire feeding device and the front heat source cooperate to achieve wire feeding welding, the powder feeding device and the rear heat source cooperate to achieve powder feeding welding, distance and output power of the front heat source and the rear heat source are adjusted, the front heat source achieves the wire feeding welding and generates certain surplus height of a welding seam, the rear heat source generates a small melting pool at the tail of a liquid metal melting pool formed by the front heat source, weld width generated by the rear heat source is 1/5-1/2 of that generated by the front heat source, and the rear heat source implements the powder feeding welding, and generates the otherwelding seam of the surplus height 1/10-1/2 of that of the welding seam generated by the wire feeding welding of the front heat source. The double heat source synchronous wire feeding and powder feeding welding method accelerates flowing of liquid metal at the tail of the weld melting pools, increases the filling amount of weld metal, and facilitates inhibition of defects of cracks, air holes andthe like.