The invention discloses a distribution type rapid assembly method for new and old foundations for a power transmission line and relates to the technical field of high-voltage transmission lines. The distribution type rapid assembly method comprises the steps that holes are punched in a column and a slab of an original foundation, and foundation bolts are embedded in the column and the slab; a prefabricated foundation slab is connected with the original foundation slab through channel steel; a prefabricated foundation column is connected with the original foundation column through angle steel. With the adoption of the distribution type rapid assembly method, the needs of size and foot distance of a newly-built iron tower are met, the problems of longer construction time and longer outage time are effectively solved, and the expense caused by the quantity of engineering material and power interruption is remarkably reduced.