The invention discloses a fine position regulating assembly for a welding robot. The fine position regulating assembly comprises a rotating motor mounted on a welding gun mounting seat, a rotating arm, an angle locating disk, angle regulating connecting plates and a welding gun clamping part for mounting a welding gun; an output shaft of the rotating motor is connected with one end of the rotating arm, and the other end of the rotating arm is connected with the side wall of the angle locating disk; one end of each of the two angle regulating connecting plates is clamped on each of two ends of the angle locating disk, and the other ends of the two angle regulating connecting plates are connected with the welding gun clamping part; the welding gun is clamped and mounted in the welding gun clamping part; the rotating direction of the rotating arm is vertical to the angle regulating direction of the angle locating disk; and a control circuit of the rotating motor is connected with a controller of the welding robot. The fine position regulating assembly is suitable for a welding machine.