The invention relates to a thin type speaker with wavy positioning support chip. In the speaker, a magnetic circuit structure comprising a U-shaped magnetic yoke and a voice coil is mounted on a cone frame; a cone frame central hole is formed in the center of the cone frame bottom, the U-shaped magnetic yoke is firmly embedded in the cone frame central hole; a positioning support chip is supported on the step arranged on the cone frame, a voice cone is arranged above the positioning support chip and supported on the cone frame; a positioning support chip central hole and a voice cone central hole are respectively opened in the centers of the positioning support chip and the voice cone, and the upper part of the voice coil is mounted in the positioning support chip central hole and the voice cone central hole; and a terminal board is mounted on the lower surface of the step on the cone frame and is connected with an extension line of the voice coil. The speaker is characterized in thatthe positioning support chip is extended from a center to periphery to form a wavy positioning support chip. The invention is intelligently structured, compact and reasonable, is capable of preventing the voice coil from touching a magnetic gap when the speaker is working, limiting transverse movement of the voice cone, improving compliance of the speaker and modifying low-frequency response characteristic.