An electric motor module for a vacuum cleaner, comprising: an outer casing provided with an air inlet at a front side of the outer casing and an air outlet at a rear side of the outer casing; and an electric motor assembly arranged in the outer casing, and cooperating with the outer casing to define an air passage in communication with the air inlet and the air outlet; and a silencer arranged at the air inlet, characterized in that: the silencer defines at least one resonant cavity in the silencer, and the least one resonant cavity have a side wall provided with a throat in communication with the resonant cavity, wherein the silencer comprises an annular first silencing component, the first silencing component cooperates with the outer casing to define a first resonant cavity, one of an inner peripheral wall and an outer peripheral wall of the first silencing component is provided with a first throat in communication with the first resonant cavity; and the silencer further comprises a second silencing component, the second silencing component is arranged at an inner side of the first silencing component, the second silencing component defines a second resonant cavity therein, and the second silencing component is provided with a second throat in communication with the second resonant cavity, wherein the second silencing component is arranged on the inner peripheral wall of the first silencing component by means of a connecting assembly. an outer casing provided with an air inlet at a front side of the outer casing and an air outlet at a rear side of the outer casing; and an electric motor assembly arranged in the outer casing, and cooperating with the outer casing to define an air passage in communication with the air inlet and the air outlet; and a silencer arranged at the air inlet, characterized in that: the silencer defines at least one resonant cavity in the silencer, and the least one resonant cavity have a side wall provided with a throat in communication with the resonant cavity, wherein the silencer comprises an annular first silencing component, the first silencing component cooperates with the outer casing to define a first resonant cavity, one of an inner peripheral wall and an outer peripheral wall of the first silencing component is provided with a first throat in communication with the first resonant cavity; and the silencer further comprises a second silencing component, the second silencing component is arranged at an inner side of the first silencing component, the second silencing component defines a second resonant cavity therein, and the second silencing component is provided with a second throat in communication with the second resonant cavity, wherein the second silencing component is arranged on the inner peripheral wall of the first silencing component by means of a connecting assembly. the silencer defines at least one resonant cavity in the silencer, and the least one resonant cavity have a side wall provided with a throat in communication with the resonant cavity, wherein the silencer comprises an annular first silencing component, the first silencing component cooperates with the outer casing to define a first resonant cavity, one of an inner peripheral wall and an outer peripheral wall of the first silencing component is provided with a first throat in communication with the first resonant cavity; and the silencer further comprises a second silencing component, the second silencing component is arranged at an inner side of the first silencing component, the second silencing component defines a second resonant cavity therein, and the second silencing component is provided with a second throat in communication with the second resonant cavity, wherein the second silencing component is arranged on the inner peripheral wall of the first silencing component by means of a connecting assembly.