The invention relate to a high-precision high-frequency response platform inclined angle measuring device and a method for measuring a platform inclined angle by adopting the same, and aims at solving the problems that the an existing inclined angle measuring sensor is low in measurement accuracy of the platform inclined angle and low in frequency response. A certain number of linear array CCD (Charge Coupled Device) are uniformly installed on one circumference of the edge of a moving base of a platform, a rotating light source installed on the platform leaves a series of light spots on a screen by scanning the linear array CCD, light spot height signals output by the linear array CCD are input into a CPU (Central Processing Unit), the current plane of the platform is a plane formed by three adjacent light spots on the CCD, and an inclined angle of the platform in the two mutually vertical directions is obtained through the spatial geometrical relationship calculation in the CPU. The high-precision high-frequency response platform inclined angle measuring device and the method for measuring the platform inclined angle by adopting the same are applicable to the technical field of ultraprecise instruments and equipment platforms.