A flat linear vibration motor is disclosed. The flat linear vibration motor includes a housing having an accommodation space; a first magnet received in the accommodation space and fixed in the housing; and a vibrator unit suspended in the housing. The vibrator unit includes a clump weight, a third magnet, a driving magnet, and a fourth magnet; a second magnet fixed in the housing, the first magnet, the vibrator unit and the second magnet arranged one by one along a vibration direction of the vibrator unit; engaging assemblies suspending the vibrator unit inside the housing and driving the vibrator unit to move along the vibration direction; wherein the flat linear vibration motor further includes a ring driving coil received in the accommodation space, the ring driving coil being spaced from and surrounding the driving magnet.