The invention discloses a portable steel fork for security guards' self-defense and riot control. The steel fork comprises a vertical rod, a sliding groove with an upward opening is formed in the vertical rod, a retractable rod is arranged in the sliding groove, a transverse rod is connected to the upper end of the retractable rod, a first arc-shaped rod and a second arc-shaped rod are symmetrically and rotationally connected to the side walls of the transverse rod, the first arc-shaped rod is connected with the second arc-shaped rod through a fixing device, two first cavities are symmetrically formed in the vertical rod, the first cavity is formed close to the opening of the sliding groove, first clamping blocks are connected to the inner walls of the sides, away from the retractable rod,of the two first cavities through first springs, the first clamping blocks penetrate through the first cavities, a plurality of first clamping grooves matched with the first clamping blocks are vertically formed in the side wall of the retractable rod, and first connecting rods are rotationally connected to the inner walls of the first cavities. The head of the steel fork is arranged into two parts which can be connected, and the steel fork can stretch and retract, so that the size is reduced, and convenience is brought to carrying.