A medical detector having a nano-scale precision. One foot of a half-frame support base (1) of the medical detector is inserted onto a side edge of an L-shaped base (2) and is fastened by means of a bolt, an electronic length measurement instrument b (14) is fixed to the other foot of the half-frame support base (1), an electronic length measurement instrument a (13) is fixed to the position of a convex corner on the top end of the half-frame support base (1), and a reversing member (10) is hingedly connected to one side of the top end of the half-frame support base (1) by means of a hinge. The bottom end of a Z-shaped workpiece (3) is connected to a workpiece block (4) in a groove manner by means of a slide block b (7), and the outer side surface of the Z-shaped workpiece (3) is connected to the back surface of the L-shaped base (2) in a groove manner by means of a slide block a (6). An extensible member (11) is fixed to the top end of the Z-shaped workpiece (3). In the detector, the two electronic length measurement instruments work together at the same time on the one hand, a deformation value of a mold can be measured, and on the other hand, a specific deformation value on that travel can be measured, so that the detector has the function for positioning a specific position. By using the mode of a clamping model of the detector body, it is ensured that a measured model has no displacement, thereby ensuring the accuracy of data.La présente invention concerne un détecteur médical présentant une précision de lordre du nanomètre. Un pied de la base de support du demi-cadre (1) du détecteur médical est inséré sur un bord latéral dune base en forme de (L) (2) et est fixé à laide dun boulon, un instrument électronique de mesure de longueur (b) (14) est fixé à lautre pied de la base de support du demi-cadre (1), un instrument électronique de mesure de longueur (a) (13) est fixé à la position dun coin convexe de lextrémité supérieure de la base de support du demi-cadre (
