The invention aims to overcome defects in the prior art, provides an air inlet channel for a double-combustion-chamber scramjet engine and an air inlet control method, and solves the technical problem about air inlet of wide-range non-axisymmetric double-combustion-chamber scramjet engines. The air inlet channel adopts the two-dimensional air inlet channel configuration and is divided by supporting plates in the flow direction to form at least one subsonic combustion flow channel and at least two supersonic combustion flow channels; the at least two supersonic combustion flow channels are evenly distributed on two sides of the at least one subsonic combustion flow channel; inner contraction section adjusting profiles and expansion section adjusting profiles are added in various flow channel designs, so that the area of a throat of the air inlet channel is controlled, the requirements of various combustion chambers for air with different compression degrees are met, the working Mach number range of the engine is broadened, the performance of the engine is improved, and the problem of difficulty in relaying with a turbine engine is solved.