The invention discloses a waterproof refurbishment construction method for an old roof and used exposing-type weather resistance colorful waterproof coating. The method comprises the steps that A, a base surface is cleaned; B, a crack is subjected to reinforcing treatment; C, joint treatment is conducted; D, water-based non-curing coating is sprayed on the base surface; E, a strengthening layer is laid on the water-based non-curing coating in the step D; and F, airing is conducted, till moisture in the water-based non-curing coating in the step D is volatilized, and the exposing-type weather resistance colorful waterproof coating is laid on the strengthening layer in the step E. By utilizing super-high cohesive force and creep self-healing performance of the water-based non-curing coating, the excellent weather resistance, colorful decoration performance and sprayability performance of the exposing-type weather resistance colorful waterproof coating and isolating and air permeable performance of a non-woven fabric, the advantages are given to full play, and composite construction is achieved, so that waterproof maintenance of the forward-arranged roof becomes simple. Pollution is reduced, and the construction period is shortened. Meanwhile, compared with a process of overall detaching a thermal insulation layer, the construction cost is reduced greatly.