The utility model discloses a thermal insulating waterproof roof, its structure includes reinforcing bar, lightning arrester, steel sheet, roof membrane, heat preservation, gas barrier film, polyurethane foam protective layer, drainage device, waterproof layer, is the reinforcing bar long 250 300cm's rectangle is equipped with two altogether, interference fit mode swing joint is adopted with polyurethane foam protective layer inside surface respectively in reinforcing bar upper end, polyurethane foam protective layer is long 300cm's rectangular panel, lightning arrester comprises cross arm, starting rod, insulated wire, insulation guard shield, insulating tube. The beneficial effects of the utility model are that be equipped with lightning arrester, let out the lightning current into theearth through starting rod and cross arm, make and avoided the thunderbolt by the protector, solved because of the thunder and lightning bleeder current to the building, produced higher counterattackvoltage leads to the electric power instrument and equipment to damage, causes the incident, the security performance height.