Instrumental joint with self-sealing function

The invention relates to an instrument joint with a self-sealing function. The instrument joint with the self-sealing function comprises a valve body, a valve element, an elastic element, a connecting nut and a sealing component, wherein the valve element is sleeved with the elastic element and arranged in the valve body; the rolling body grooves are correspondingly formed in the outer side of the upper end of the valve body and the inner side of the connecting nut; rotatable movable connection of the valve body and the connecting nut is achieved through the cooperation of the rolling body grooves of the valve body and the connecting nut and a rolling body. The instrument joint with the self-sealing function has the advantages of being simple in structure, good in sealing performance, high in reliability, low in cost and the like.