The invention provides a multifunctional air purifier and relates to the field of air purifiers. The air purifier comprises a rectangular shell and a movable base with the size equal to that of the shell, the movable base is connected with universal wheels, the shell is tightly attached to the movable base, a motor is arranged in the movable base, the motor is used for supplying power for the airpurifier, and an air inlet is formed in the shell from left to right, a first cross-flow fan, a first purification module, a second purification module, a second cross-flow fan, a third purification module, a fourth purification module, multifunctional modules and an intelligent detection system. Various novel filtering layers are adopted, so that impurities, dust, bacteria and the like in air canbe effectively removed, and the quality of the purified air is good. Various customized multifunctional modules are provided, and the multifunctional modules comprise fragrance modules and strong-effect disinfection modules, so that corresponding functions can be provided according to the purpose of a user, and the increasingly personalized and customized requirements of people can be met.