Safety mechanism for electric roller shutter

The invention discloses a safety mechanism for an electric roller shutter. The safety mechanism is characterized by comprising a ground beam connected to the lower surface of the roller shutter; the safety mechanism is characterized in that the ground beam comprises a lower beam and an upper beam; the lower beam comprises a lower beam body and a square groove formed in the bottom end of the lower beam; lower beam wing plates are arranged at two sides of the upper surface of the square groove; the upper beam connected with the roller shutter comprises a square object, upper beam wing plates, vertical plates and transverse plates; the square object is arranged in the square groove in a manner of sliding up and down; the upper beam wing plates are arranged at two sides of the upper surface of the square object; the vertical plates are arranged on the outer edges of the upper beam wing plates; the transverse plates are arranged at the inner sides of the vertical plates and are located below the lower beam wing pl