A two-way fixing steel plate (2) and a bone fixing system. The two-way fixing steel plate (2) comprises a steel plate body (20). The steel plate body (20) is used for being emplaced from the front side of a bone (1) and is provided with a structure fitting the front side of the bone (1) so as to fixedly attach to a fractured extremity thereof. The steel plate body (20) is provided on the structure fitting the front side of the bone (1) with at least two pairs of guide openings (2101, 2102, 2103, 2104, 2105, 2106, 2107, and 2108) respectively through which first locking screws (2201, 2202, 2203, 2204, 2205, 2206, 2207, and 2208) run. The angles of the guide openings (2101, 2102, 2103, 2104, 2105, 2106, 2107, and 2108) allow the first locking screws (2201, 2202, 2203, 2204, 2205, 2206, 2207, and 2208) running through same to jointly clamp an intramedullary nail (3), thus implementing control of the rotation and axial stability of the intramedullary nail (3). The two-way fixing steel plate (2), by means of the specific angles at which the guide openings (2101, 2102, 2103, 2104, 2105, 2106, 2107, and 2108) of the steel plate body (20) are provided, when fitted with the first locking screws (2201, 2202, 2203, 2204, 2205, 2206, 2207, and 2208), allows the implementation of support, rotation resistance, and axial stability with respect to the fractured extremity part of the bone (1) so as to further enhance the reliability of fixation after reposition, thus effectively ensuring and aiding stable reposition and recovery of the fractured part.L'invention concerne une plaque d'angle pour fixation bidirectionnelle (2) et un système de fixation osseuse associé, la plaque d'angle pour fixation bidirectionnelle (2) comprenant un corps en acier (20), lequel corps en acier (20), conçu pour fusionner depuis le côté avant d'un os allongé (1), comporte une structure en correspondance avec la surface latérale avant de l'os allongé (1) en vue de fixer par adhésion une fracture osseuse,
