The utility model discloses a can improve three rifle welding mechanism of compressor foot rest bonding speed, get the mechanism including welding control mechanism, welder fixture and foot rest automatic clamp, welding control mechanism connects the foot rest automatic clamp and gets the mechanism, and welder fixture sets up and gets between the mechanism at welding control mechanism and foot rest automatic clamp, welding control mechanism passes through U type seat and installs in the compressor assembly line. Mechanism, welder fixture and welding control mechanism are got to the foot rest automatic clamp of mutually supporting, around can satisfying about, upper and lower arbitrary position adjustment. Welding control mechanism uses servo motor's orientation module, but the fine control has welded acnode and receipts acnode, guarantees to weld the quality. Especially, annular sensor bracket's use, the butt welding contact has carried out the secondary affirmation especially, has avoided because the production of the defective products that servo trouble results in.