The invention relates to a fluorescent magnetic powder flaw detection flow line for a drill rod joint, which comprises a mechanical bed system, a feeding and conveying system, a magnetic suspension spraying and recycling system, a rotary observation system, a drill rod joint moving mechanical arm system, a drill rod joint discharging system and a dark room (26), wherein the mechanical bed system comprises a material rack (9) and a discharging platform bracket (29); the feeding and conveying system comprises a conveyor belt (2) and a joint tray (3); the magnetic suspension spraying and recycling system comprises a longitudinal magnetizing electrode (4), a circumferential-magnetizing conducting electrode (5), a threading air cylinder (10), an outer sprayer (7) and an inner sprayer (11); the rotary observation system comprises a rotary conveyor idler (13), a detection platform rotary air cylinder (31) and a threaded rod (32); the drill rod joint moving mechanical arm system comprises a mechanical arm (18), a horizontal lead screw (20), a horizontal sliding table (21), a longitudinal lead screw (19), a longitudinal sliding table (22), a base (35) and a mechanical arm air cylinder (36); and the drill rod joint discharging system comprises a discharging frame (15), a discharging frame air cylinder (24) and a discharging frame air cylinder pull rod (34). The invention provides the fluorescent magnetic powder flaw detection flow line for the drill rod joint.