An air intake device includes a supercharger, a connection tube, an intercooler, and an intake manifold. The supercharger is connected to an exhaust port of a cylinder. The intercooler is connected to the supercharger through the connection tube. The intake manifold is connected to the intercooler and an intake port of the cylinder. The intercooler is located above a cylinder head of an engine. The device of the present disclosure features less height space occupation, a short connection tubeline between elements and a compact structure, which is beneficial for an increase of the pressurization response speed and reduction in the cost.