Old roof waterproof transformation process and spraying device thereof

The invention relates to the technical field of building waterproof transformation, and particularly discloses an old roof waterproof transformation process and a spraying device thereof, the old roof waterproof transformation process comprises the following steps: S1, cleaning an old roof, and removing an original covering layer of the old roof; s2, mortar is scraped and brushed on the base surface, and a waterproof coiled material is laid to form a first waterproof layer; s3, protective mortar formed by mixing a waterproof agent and cement mortar is laid on the surface of the waterproof roll to form a protective layer; s4, waterproof paint is sprayed to the surface of the protective layer through the spraying device to form a second waterproof layer; and convenient spraying of the waterproof coating is achieved through the spraying device, the laid waterproof coating is blow-dried in time, and the possibility that the waterproof coating flows, and consequently the waterproof coating is laid unevenly is redu