The invention relates to an electric dismounting tool of a separating brake buffer.The electric dismounting tool comprises a rack, a pull rod sleeve and a power supply control cabinet, the rack is provided with a press-fit head which can slide vertically on a vertical plane, the end, connected with the rack, of the press-fit head is driven by an electric mechanism to achieve vertical reciprocating motion, the press-fit head is a barrel body with an opening facing downwards vertically, a notch is formed in the circumferential side of the press-fit head, the central axis of the pull rod sleeve is provided with a cylindrical hole used for sleeving a piston rod joint of the separating brake buffer therein, the external diameter of the pull rod sleeve is the same as that of a piston rod of the separating brake buffer, and the diameter of the cylindrical hole is greater than the external diameter of the piston rod joint of the separating brake buffer.The electric dismounting tool of the separating brake buffer can be used for dismounting and mounting the separating brake buffer under the circumstance of one-man operation and is simple in structure and convenient to operate, manpower is saved, and meanwhile time is saved.