The invention discloses an argon-blowing joint. The argon-blowing joint comprises an argon-blowing mechanism and a regulating mechanism, wherein the argon-blowing mechanism comprises an argon-blowing body; the regulating mechanism comprises an accommodating body, a transverse plate and an air cylinder; the argon-blowing body is fixedly arranged on the accommodating body; a through hole is formed in the top wall of the argon-blowing body; a gas inlet and a gas outlet are symmetrically formed in the side wall of the argon-blowing body; the gas inlet and the gas outlet communicate with the through hole; a convex accommodating slot is formed in the accommodating body; the through hole communicates with the accommodating slot; the transverse plate is transversely in sliding connection with the side wall of the accommodating slot; two regulating through holes are symmetrically formed in the side wall of the accommodating slot; the air cylinder is fixedly arranged on the inner bottom wall of the accommodating slot; and a telescopic pole of the air cylinder is fixedly connected with the bottom wall of the transverse plate. The argon-blowing joint can be used for regulating pressure and speed when argon gas charges and discharges by regulating the position of a central rod through a motor; when molten steel overflows or argon-blowing equipment is damaged and cannot stop blowing argon gas, the air cylinder drives the transverse plate to move downwards and argon gas escapes from regulating through holes, so that molten steel splashing caused by blown-in argon gas is avoided. The argon-blowing joint can stop argon-blowing work.