NOVELTY - Kettle comprises a reactor body (1), a reaction chamber (16), a heating chamber (6) and a reactor cover (4). A first cavity wall (3) of the reaction chamber is set with second cavity wall of the heating chamber. The second cavity wall is disposed within the reactor body. A connecting strip is connected between the first cavity wall and the second cavity wall. A heating station is set at the bottom of the second cavity wall of the reactor body. The reactor cover is sealed with the reaction chamber and the heating chamber. The second cavity wall is disposed within the reactor body.    USE - The kettle is useful for preparing crude oil from waste animal and vegetable oil (claimed).    ADVANTAGE - The kettle avoids direct heating and black smoke emission at high temperature.    DETAILED DESCRIPTION - Kettle useful for preparing crude oil from waste animal and vegetable oil comprises a reactor body (1), a reaction chamber (16), a heating chamber (6) and a reactor cover (4). A first cavity wall (3) of the reaction chamber is set with second cavity wall of the heating chamber. The second cavity wall is disposed within the reactor body. A connecting strip is connected between the first cavity wall and the second cavity wall. A heating station is set at the bottom of the second cavity wall of the reactor body. The reactor cover is respectively sealed with the reaction chamber and the heating chamber. An exhaust pipe and a stirring paddle are provided with reactor cover. The heating chamber is filled with water. The inner part of the first cavity wall is provided with a first annular cartridge. A first annular snap is provided with corresponding to the position of the reactor cover. The first annular cartridge is matched with the first annular snap. The side of the matched annular cartridge and the first annular snap is set with a first sealing ring. The outside of the second cavity wall is provided with second annular cartridge. The second annular snap is provided with corresponding to the position of the reactor cover. The second annular cartridge is matched with the second annular snap. The side of the matched second annular cartridge and the second annular snap is set with a second sealing ring.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the kettle for preparing crude oil from waste animal and vegetable oil.    Reactor body (1)    First cavity wall (3)    Reactor cover (4)    Heating chamber (6)    Reaction chamber (16)