The invention discloses a joint for an automobile air conditioner. The joint comprises a joint body, wherein an introduction pipe is arranged at the bottom end of the joint body; the outer wall of the right side of the joint body is sleeved with an outer cap; a clamping ball is arranged between a wrap frame and the outer cap; a first groove is formed at the right end of the inner side of the outer cap; a conical plug is arranged on the right end of a slide bar; the conical plug is matched with a baffle plate. In the joint for the automobile air conditioner, the clamping ball, the first groove and the conical plug are matched with one another, a tube head is inserted into the wrap frame, the clamping ball enters a second groove, the outer cap presses the clamping ball, and the carrier rod breaks fitting between the conical plug and the baffle plate leftwards to connect a connecting tube with the joint body; when detachment is required, the conical plug plugs the baffle plate under the elastic action of a second compressed spring, so that Freon inside the automobile air conditioner is prevented from leaking; the joint has high airtightness, and can meet the use demand of a user; leakage of Freon is not caused in an assembling process, and environmental pollution is avoided.