The invention discloses a low-frequency ultra-thin telephone receiver. A driving mechanism of the low-frequency ultra-thin telephone receiver comprises an armature section and a coil section, wherein the armature section is E-shaped and comprises a base portion, two wing portions and a middle portion, the base portion, the two wing portions and the middle portion are formed in an integrated mode, the middle portion comprises a root part located on the base portion, the root part extends forward to form a vibrating diaphragm part, at least one through hole is formed in the vibrating diaphragm part, and the coil section is arranged on the root part in a sleeved mode at intervals. A shell of the low-frequency ultra-thin telephone receiver comprises an upper shell and a lower shell, wherein the upper shell is arranged at the top of the driving mechanism in a covered mode, and comprises a cover plate and cover edges which are formed by extending downward from the periphery of the cover plate, a first magnet is fixedly connected to a section, covered at the top of the vibrating diaphragm part, of the inner wall of the cover plate, the upper shell is made of magnetically soft alloy, the lower shell is arranged at the bottom of the driving mechanism in a covered mode relative to the upper shell, a second magnet is fixedly connected to the inner wall of the lower shell relative to the first magnet, the lower shell is made of magnetically soft alloy, and a sounding hole is formed in the upper shell or the lower shell. According to the low-frequency ultra-thin telephone receiver, the low-frequency output can be enhanced, and the thickness of an existing telephone receiver is reduced to the largest extent.