The invention discloses an aluminum alloy melting tilting furnace. The aluminum alloy melting tilting furnace comprises a melting furnace and a cavity used for melting an aluminum alloy into metal liquid; the melting furnace is covered with an exhaust gas cover in the vertical direction, and the exhaust gas cover is used for absorbing exhaust gas generated in the melting process of the aluminum alloy; a heat preservation chamber is arranged at the parallel position of the melting furnace and used for keeping the metal liquid at a certain temperature in a heat preservation mode so as to meet the needs of a production technology; a hydraulic system is arranged at the bottom of the melting furnace and used for turning over the melting furnace to a certain angle through a turnover shaft for tilting; and a chimney system with the purifying effect is arranged on the top of a gas guiding cover. According to the technical scheme, the melting furnace collects exhaust gas in the tilting process,the exhaust gas can be collected at different titling angles, the exhaust gas can be effectively collected, the construction space is saved, the production efficiency is improved, the best heat preservation effect is achieved, energy consumption can be reduced through the preheating effect, the optimal heat exchange effect is guaranteed, metal loss is reduced, and the oxidization rate is very low.