The invention provides an extrusion strengthening method for double lug holes. The strengthening method includes conducting extrusion strengthening on an upper lug hole and a lower plug hole with twoextrusion rods simultaneously, wherein an upper extrusion rod 6 and a lower extrusion rod 3 are connected in a coaxial detachable mode. By means of the extrusion strengthening method for the lugs holes of joint parts, the fatigue limit of the lug holes of the joint parts can be improved, and the fatigue life can be prolonged.