The cable tension monitoring is important for safety production of relevant industry.A new cable tension microbend fiber optic sensor is proposed,the sensor structure with spring is introduced,mechanical transfer function of sensors is given.Through nonlinear characteristics analysis of trapezoid springs,trapezoid springs can be used to nonlinear compensation of the cable tension microbend fiber optic sensors.Test results show that after nonlinear compensation of trapezoid springs,the cable tension microbend fiber optic sensor can obtain good linear response.The cable tension microbend fiber optic sensor can be used in elevators,tower cranes,cranes,aerial ropeways and other occasions of tension monitoring.