An internal fixation plate comprises a plate body (1) and a locking screw (4). The plate body (1) has a first surface and a second surface opposing each other, and two ends of the plate body (1) are respectively provided, along a longitudinal direction of the plate body (1), with one sliding groove (2) passing through the first surface and the second surface. An inner side of the sliding groove (2) is shaped as a step to form a recess (3) exposed at the first surface, such that the sliding groove (2) has a first width (W1) on the first surface and a second width (W2) on the second surface, and the first width (W1) is greater than the second width (W2). The locking screw (4) comprises a head (41) and a shank (42), and the shank (42) is inserted into the sliding groove (2) from the first surface, such that the head (41) is located in the recess (3) and supported by the sliding groove (2), and the locking screw (4) can slide along the sliding groove (2). The internal fixation plate replaces a screw hole with the sliding groove (2), thus facilitating a minimally invasive procedure, actively applying a pressure during a healing process after the procedure, and accordingly accelerating healing of a bone fracture. The internal fixation plate has a simple structure, is convenient to use, and has superior performance in promoting bone fracture healing.La présente invention concerne une plaque de fixation interne qui comprend un corps de plaque (1) et une vis de blocage (4). Le corps de plaque (1) comporte une première surface et une seconde surface opposées lune à lautre et deux extrémités du corps de plaque (1) sont respectivement prévues le long dune direction longitudinale du corps de plaque (1), une rainure de coulissement (2) traversant la première surface et la seconde surface. Un côté interne de la rainure de coulissement (2) a la forme dune marche afin de former un évidement (3) exposé au niveau de la première surface, de sorte que la rainure de coulissement (2) ait
