The invention discloses a multifunctional combined experimental box for simulating a haze environment. The multifunctional combined experimental box comprises a combined experimental box body, wherein the combined experimental box body is composed of a plurality of single bodies with the same structure and size in a splicing manner; a haze generation system is arranged at the outer part of the combined experimental box body; a haze inlet is formed in the combined experimental box body; the haze inlet and the haze generation system are connected by a main path gas flue provided with a flow control valve, an axial flow type air suction fan and an anti-backflow exhausting fan, and a branch path gas flue; the combined experimental box body is internally provided with a haze mixing system for rapidly and uniformly mixing haze; and a fresh air exchanging system and an illumination system are arranged on the top of the combined experimental box body. According to the multifunctional combined experimental box for simulating the haze environment, a plurality of types of haze components can be independently generated at the same time and the truth of simulating the haze environment is improved. A plurality of sets of sensors are used for collecting haze environment parameters from three height layers so that the effectiveness and the accuracy of all the parameters of the haze field are ensured.