The invention relates to floorboards, in particular to a floorboard assembled structure and a method for assembling the same. The floorboard assembled structure comprises floorboard strips and concave fasteners; adjacent floorboard strips are in mutual coordination through tenons and mortises; the ends of the floorboard strips which are close to the mortises are provided with first grooves with downward openings, the ends of the floorboard strips which are close to the tenons are provided with second grooves with downward openings; the sidewalls of the second grooves which are close to the tenons are inclined relative to the bottom faces of the floorboard strips; the concave fasteners comprises first clamp strips and second clamp strips which are positioned at two ends of the concave fasteners; both two sidewalls of the first clamp strips are provided with first clamp grooves; first elastic pieces are embedded in the first clamp grooves; the first clamp strips are mounted in the first grooves; and the second clamp strips are mounted in the second grooves. The floorboard assembled structure and the method for assembling the same provided by the invention have the advantage of convenience and simplicity for mounting.