The invention discloses an automatic saw chain assembly machine. The machine comprises a rack, a tank chain conveying mechanism and an overturning rail, wherein the tank chain conveying mechanism andthe overturning rail are arranged on the rack, the tank chain conveying mechanism comprises a horizontal transmission part, the horizontal transmission part comprises a first horizontal transmission section and a second horizontal transmission section, a chain shaft swinger, a driver blade swinger, a blade swinger, a connecting piece swinger and an A-side riveting assembly which are arranged in afirst horizontal transmission section transmission direction in sequence, a blade swinger, a connecting piece swinger and a B-side riveting assembly are arranged in a second horizontal transmission section transmission direction in sequence, the A-side riveting assembly and the B-side riveting assembly complete riveting of an A end and B end of a chain shaft respectively, the overturning rail is used for turning a saw chain of which A-side riveting is completed on the first horizontal transmission section by 180 degrees into the second horizontal transmission section to be subjected to B-sideriveting. The automatic saw chain assembly machine improves the assembly efficiency and assembly quality of the saw chain.