A cantilever beam of uniform strength structure FBG weighing sensor is developed.In order to determine the reliability of the sensor weighing results ,the theoretical basis of sensor design was deduced by analyzing the load trans mission process and the sensing principle of the grating sensitive element,and a static load experimental device calibrated with a standard mass was designed. Analysis of the static sensing data through MATLAB and analysis of uncertain fac tors in calibration process and then determine the uncertainty index of sensor. The experimental results show that the sensitivity of the developed cantilever b eam of uniform strength type fiber bragg grating weighing sensor is 0.0069n m/ N,the nonlinear error is 4.93%FS,the repeatability error is 2.59%FS,the hyste resis error 3.21%FS,and the measurement uncertainty of the sensor is 0.409N.T he designed cantilever beam of uniform strength type fiber bragg grating weighin g sensor has great static characteristics,and the measurement uncertainty withi n the range of the sensor has a small effect on the result,which meets the perf ormance requirements.The calibration method effectively improves the calibratio n efficiency and accuracy,and provides ideas and engineering practices for the quantitative analysis of the comprehensive performance of other types of sensors .