Ultrahigh pressure grease injection connector

The invention relates to the field of petroleum pipeline valves, in particular to an ultrahigh pressure grease injection connector which comprises a valve bonnet, a valve body, a stop ball and a return spring, wherein the stop ball and the return spring are arranged in the valve body. The ultrahigh pressure grease injection connector is characterized in that the valve body comprises a parent body and a valve spool capable of axially moving, the parent body is provided with a through hole, the valve spool is arranged in the through hole of the parent body, the parent body is hermetically connected with the valve bonnet, a stepped through hole is formed inside the valve spool, the stop ball and the return spring are arranged in a large hole of the stepped through hole to realize one-way conduction, a boss is arranged inside the valve bonnet, and the valve bonnet hermetically contacts with a small hole of the stepped through hole inside the valve spool through the boss. By the aid of the structural design, compared with a traditional ultrahigh pressure grease injection connector, the ultrahigh pressure grease injection connector has the advantages that nonmetal sealing elements are discarded, so that the sealing performance at the extreme temperature is ensured. Besides, the locking force of a locking conical seal is changed, and seizure of contact surfaces is avoided.