The invention discloses a rotary vibration screen resonance buffer device. A protection cover is arranged on the upper portion of a screen machine main body and provided with a material inlet. A screen frame is arranged in the screen machine main body. A discharging outlet is formed in the side wall of the screen machine main body. A vibration motor fixedly connected with the screen frame is arranged in a screen machine bottom frame at the bottom of the screen machine main body. An upper annular electromagnet is fixedly and additionally arranged in the position, close to an upper flail block, of the outer edge of an upper end cover of the vibration motor. A lower annular electromagnet is fixedly and additionally arranged in the position, close to a lower flail block, of the outer edge of a lower end cover of the vibration motor. The vibration motor, the upper annular electromagnet and the lower annular electromagnet are electrically connected with a controller through circuits. According to the rotary vibration screen resonance buffer device, severe resonance shaking generated by the vibration motor after the device is stopped can be effectively avoided, the process of gradual decrease of the motor rotation speed when a screen machine is stopped is shortened, the machine body resonance generation time is shortened, and the service life of a rotary vibration screen is prolonged.