The invention discloses a fast combined lifting tool of an electric system. The fast combined lifting tool comprises four support columns and cross arms, wherein the lower parts of the support columns are provided with rolling wheels; the upper ends of the support columns are articulated with upper arms, and the upper middle parts of the support columns are articulated with lower arms; fixing holes and fixing parts are uniformly distributed on the support columns, the upper arms, the lower arms and the cross arms; the four support columns are encircled into a rectangular shape and pairwise form one group; two upper arms of two support columns of each group are upwards crossed and fixed together; at least one cross arm is supported between two X frames, and the cross arm is provided with a lifting mechanism; the rest two upper arms are downwards crossed into an X shape and fixedly connected with the corresponding support columns together through the fixing holes; one lower arm of one support column of each group is slantingly downwards fixedly connected with the lower parts of adjacent support columns of the corresponding group together, and the other lower arm is slantingly upwards fixedly connected with the same support columns of the corresponding group correspondingly. The fast combined lifting tool disclosed by the invention is reasonable in structure, suitable for site lifting, heavy transferring and height-ascending assistance and especially suitable for electricity maintenance.