1. A sensing voltage setting method of a solid state storage device, wherein the solid state storage device comprises a flash memory module configured for storing data, the flash memory module has a plurality of memory cells, each of the memory cells has a first storage state and a second storage state, and the sensing voltage setting method comprises: adjusting a predetermined read voltage of the memory cells to obtain a plurality of detection read voltages; applying the predetermined read voltage and the detection read voltages respectively to the memory cells to read a plurality of verification bit data corresponding to the predetermined read voltage and the detection read voltages; calculating and recording a plurality of statistical parametric values between the predetermined read voltage and the detection read voltages adjacent to each other according to the verification bit data corresponding to the predetermined read voltage and the detection read voltages; and obtaining an optimized read voltage according to the statistical parametric values.