The signal anti jamming method of the ring ball array torque sensor based on the spherically symmetric and electromagnetic induction principles has been analyzed and studied in this paper. The lock in amplifier circuit and LabVIEW measuring system have been designed. The ring ball array consisting of many magnetic balls and the electro magnetic detector were fully enclosed. The experiment on the signal acquisition and processing of the torque has been carried out. The experiment results indicated that the torque sensor had the features of good ability of anti jamming, high precision and easy to use. It can accomplish the dynamic measurement of mechanical spindle torque in the extreme environment.