The invention disclosed a system and a method for simulating irradiation heating environment of a hypersonic aircraft. The system comprises an environment simulation chamber, an infrared lamp array, a laser heating unit and a vacuumizing unit. The infrared lamp array arranged on the inner wall of the environment simulation chamber is used for carrying out medium-high temperature heating on the whole aircraft or local parts of the aircraft, the environment simulation chamber is externally connected with the vacuumizing unit which is used for increasing and reducing pressure inside the environment simulation chamber, and the laser heating unit is arranged outside the environment simulation chamber and emits a laser beam which can penetrate through the glass which is arranged on the side wall of the environment simulation chamber so as to carry out ultrahigh temperature heating on the whole aircraft or the local parts of the aircraft. The infrared lamp array and a solid-state laser are adopted as heating sources, therefore, the large component of the aircraft even the whole aircraft can be tested, and the technology difficulty of height thermal environment comprehensive simulation islittle; and the system has simple structure, and is more flexible.