The invention relates to the technical field of roofs, and discloses a roof heat preservation and waterproof structure and a construction method thereof. The roof heat preservation and waterproof structure comprises a base layer, a leveling layer is connected to the upper side of the base layer, a flexible waterproof layer is connected to the other side of the leveling layer, a heat preservation layer is connected to the side, away from the leveling layer, of the flexible waterproof layer, a rigid waterproof layer is connected to the side, away from the flexible waterproof layer, of the heat preservation layer, a reinforcing mesh layer is connected to the side, away from the heat preservation layer, of the rigid waterproof layer, a tile house layer is connected to the reinforcing mesh layer, and tiles are connected to the tile house layer. According to the roof heat preservation and waterproof structure and the construction method thereof, the problems that an existing roof needs to bedirectly exposed to the external environment and needs to be exposed to wind, sun and rain, waterproof heat-preservation materials are prone to aging and permeating, and the waterproof heat-preservation performance of the structure is affected can be solved.