The invention relates to a motor supporting structure and an air purifier. The motor comprises a motor body and an output shaft. The motor supporting structure comprises a bearing part and a motor accommodating groove arranged on the bearing part, wherein the motor accommodating groove is used for accommodating the motor body, the bearing part is used for supporting the motor accommodating groove,the motor accommodating groove is in the shape of a cone, the large end of the cone is connected with the bearing part, and the output shaft is located at the side where the small end of the motor accommodating groove is located in an assembly state. The motor supporting structure realizes reliable assembly through changing the assembly direction of the motor, and the motor is put in from the outer side of an air duct, thereby reducing high requirements for the assembly process. Compared with the traditional structure scheme, the motor supporting structure is more reliable, compact in structure and reasonable in layout.