The invention discloses a steel sheet fixture applied to laser cutting. A rectangular bearing platform is molded on the upper end face of a supporting seat; a via hole passing through the bottom surface of the supporting seat is formed in the center of the bearing platform; a lower magnetic block shaped as the Chinese character 'Hui' is embedded into the bottom surface of the bearing platform around the via hole; an upper magnetic block which attracts the lower magnetic block is arranged along the upward direction of the lower magnetic block; the upper magnetic block is fixed to the bottom surface of a fixed seat shaped as the Chinese character 'Hui'; the fixed seat is inserted into the bearing platform of the supporting seat; an insertion groove passing through the outer wall of the supporting seat is formed in the lower end of the side wall of the bearing platform of the supporting seat; an L-shaped adjusting sheet is inserted into the insertion groove; the adjusting sheet consists of a horizontal part and a vertical part; the vertical part of the adjusting sheet is distributed on the outer side of the supporting seat, and a horizontal screw rod is inserted into the vertical part; one end of the screw rod is fixed to the supporting seat in a threaded way; an adjusting nut is threaded on the screw rod; the adjusting nut is pressed against the vertical part of the adjusting sheet. By adopting the steel sheet fixture, a magnetic or nonmagnetic metal sheet can be clamped and positioned conveniently, and meanwhile the position of the metal sheet can be adjusted.