The utility model relates to a positioning device of a sensor and concretely relates to a fixed platform of sensor universal regulation. The problems that an existing device can not subjected to high precision micro regulation, the position is easily changed due to external force after positioning and tilt adjustment can not be carried out. The technical scheme is as follows: the fixed platform includes a substrate which is provided with a first groove and a second groove, the first groove is provided with a first rack, a first gear shaft is supported in the second groove, a first gear is fixed on the first gear shaft, the first rack is provided with a third groove which is internally provided with a second rack, a second gear shaft is supported at the bottom surface of the third groove, a second gear is fixed on the second gear shaft, a worm-wheel shaft is fixed on the second rack, a work wheel is supported, a rotation platform is fixed, and a worm rod is supported by the upper surface of the second rack. The fixed platform has the advantages of accurate positioning, little possibility of changing the position due to external force, and the use of the fixed platform on an inclined plane.