The invention relates to the field of connectors and in particular relates to a detachable plug-in connector. The present invention provides the detachable plug-in connector that comprises an insert tube with a locking matching portion, a receiving end for accommodating the insert tube, a self-locking unit for limiting the insert tube from moving; the self-locking unit is accommodated in the receiving end, and comprises two limiting arms each with a limiting projection, an elastic bend portion fixedly connected with the two limiting arms, and movable portions fixed between the limiting projections of the limiting arms and the elastic bend portion or on two ends of the elastic bend portion; the receiving end is provided with a guiding portion for matching the movable portions to move. In the detachable plug-in connector of the present invention, as the self-locking unit comprises the elastic bend portion and two limiting arms, the self-locking unit is simple in structure, and simple and convenient to mount.