The invention provides a curved surface locating minimally invasive acetabular front column screw aiming device which includes a body of a triangular truss structure. The body includes two main locating feet, an auxiliary locating foot, one main support wall and two auxiliary support walls. The preparation method comprises the following steps that S01, goal hip bone medical image data are obtained; S02, point set of the center point of front column region is obtained; S03, the channel direction of a front column screw is determined; S04, the maximum diameter of an inner cylinder in the channeldirection of the front column screw is determined; S05, the external diameter of a bone screw and the inner diameter of a guide drill jig channel are determined; S06, a drilling channel of a front column bottom hole is built; S07, the three-dimensional model of the aiming device is established; and S08, the aiming device is prepared by 3D printing. The internal fixation of acetabular front columnlag screw can be carried out accurately and rapidly by using the aiming device, not only is the operation efficiency improved, but also the accuracy and safety of the operation are guaranteed.