The invention relates to an automatic assembling machine for a hair curler. The automatic assembling machine comprises an assembling platform, a roller conveying mechanism, a roller and yarn winding mechanism, a yarn conveying mechanism, a yarn cutting mechanism, a welding mechanism and a roller moving and picking mechanism, a roller on the roller conveying mechanism is picked in a clamped mode and moved onto a locating rod through the roller moving and picking mechanism, yarn is conveyed to the locating rod and located to the edge of the locating rod in a contact mode through the yarn conveying mechanism, the lower portion of the yarn is cut off according to the predetermined length through the yarn cutting mechanism, the locating rod rotates to drive the yarn to rotate, thereby the yarn is wound on the outer circumference of the roller, distributing edges of the yarn are welded through the welding mechanism, the roller moving and picking mechanism moves the hair curler away from the locating rod and moves a new roller to the locating rod, and the mentioned process is conducted in a continuous and reciprocating mode. The automatic assembling machine is convenient to use, hair curler assembling efficiency is greatly improved, and the whole process is operated and controlled automatically through a master control program, influence of human factors is reduced, and high quality stability is achieved for hair curlers produced within the same batch.