The invention discloses a multi-freedom portable type dismounting auxiliary tool for a machine tool main shaft. The multi-freedom portable type dismounting auxiliary tool comprises a magnetic attraction type base, a multi-freedom adjustable type bracket and a main shaft bolt dismounting mechanical hand, wherein the main shaft bolt dismounting mechanical hand is connected to the magnetic attractiontype base through the multi-freedom adjustable type bracket; the main shaft bolt dismounting mechanical hand comprises a machine body, a magnetic adapter sucking disc, a main shaft axial end surfacemagnetic sucking head, and a main shaft radial supporting plate as well as bolt dismounting wrenches; the magnetic adapter sucking disc is arranged at the tail end of the machine body; the main shaftaxial end surface magnetic sucking head is arranged at the front end of the machine body; a telescopic table is mounted between the main shaft axial end surface magnetic sucking head and the machine body; the main shaft radial supporting plate is connected to the front end of the machine body through a telescopic pole; the bolt dismounting wrenches are mounted on the machine body; the bolt dismounting wrenches are uniformly arranged in the peripheral direction of the machine body; the rod bodies of the bolt dismounting wrenches are of telescopic type structures; and sleeves of the bolt dismounting wrenches are different. The bolt dismounting wrenches control the sleeves to rotate through a hydraulic drive way.