The antenna design is an important part for realizing wireless and passive surface acoustic wave torque measurement. The segmented loop antenna of the reader is designed for the rotating shaft structure of the torque to be measured, and the three-dimensional electromagnetic simulation software HFSS is used to simulate the center frequency, bandwidth, input impedance, and directivity pattern. On the basis of simulation and optimization, the segmented loop antenna is fabricated and tested. The measurement results show that the center frequency of the antenna is 431.6 MHz, the bandwidth is 424~440 MHz, the input impedance is close to 50 Ω, and the plane where the antenna is located has good omni-directionality. The surface acoustic wave torque measurement system including the reader antenna can realize accurate torque measurement, and the full-scale error is 2.5% from -80 N·m to 80 N·m.