Aiming at the problems of the single sensitive orientation and narrow range of magnetic fluid tilt sensor, an omnidirectional, wide range spherical tilt sensor based on the similar gravity pendulum principle is designed by using the tunnel magnetoresistance sensor to complete the extraction of the tilt electrical signals. Firstly, the electrical signal acquisition system is designed and then the acquisition capability of the system is tested. Secondly, the linear relationship between the output voltage within a certain range and the tilt angle is determined by experiment.Finally, the measurement capability of the tilt sensor is tested. The results show that the tilt sensor has good measurement accuracy with the range of 10° ~ 170°.