The invention discloses an extrusion type bi-trunking milling tool absorber. According to the absorber, the principle that under the action of an electromagnetic field, magnetorheological fluid can produce extrusion acting force within several milliseconds is applied, the inherent frequency of a milling tool is improved, and acute vibration of the milling tool is avoided. The absorber is provided with an inner shaft sleeve, mechanical seals, an injection hole, wireways, a double-coil groove, a clamping shaft sleeve, a core body, a magnet exciting coil, an end cover and the magnetorheological fluid. The injection hole is machined in the tail end of the core body of the absorber, convenient injection and replacing of the magnetorheological fluid are achieved, and the machining process and the using efficiency of the absorber are improved. By means of the wireways in the outer side face of the core body of the absorber, reasonable layout of a lead of the magnet exciting coil is achieved, and the intervene problem between the lead and the clamping shaft sleeve and the end cover is avoided. By means of the inner shaft sleeve, the magnetorheological fluid and the milling tool are separated, the situation that impurities in the working environment pollutes the magnetorheological fluid is avoided, and rapid dismounting and mounting of the milling tool is achieved.