The utility model provides an acrylic filament oscillator, which includes a motor (1), a belt pulley (2), a pull rod (3), a rocking bar (4) and an oscillating bar (5), wherein the motor (1) and the belt pulley (2) are connected through a belt; one end of the pull rod (3) is fixedly connected with a non-central position of the belt pulley (2); the other end of the pull rod (3) is connected with the rocking bar (4); a shaft is arranged in the center of the rocking bar (4), and the rocking bar (4) can rotate around the shaft; the other end of the rocking bar (4) is connected with the oscillating bar (5); and the two ends of the oscillating bar (5) are supported and mounted on a filament guide frame (6). The acrylic filament oscillator stretches, vibrates and separates filaments or webs as per a vibration principle, eliminates partial potential contraction, enables the filaments to be further stretched, parallel, straight, and uniform in thickness, enables the stretching amplitude to reach the design value, remarkably improves the stretch breaking effect of the filaments, and greatly lowers the failure rate of a stretch breaking machine.