Sensor circuit and motion data detection device

The invention discloses a sensor circuit and a motion data detection device. The sensor circuit comprises a signal processing module, a first sensing branch circuit, a second sensing branch circuit, a third sensing branch circuit and a fourth sensing branch circuit, each sensing element comprises a first sensing element, a first node, a second sensing element, a third sensing element, a second node, a fourth sensing element, a fifth sensing element, a third node, a sixth sensing element, a seventh sensing element, a fourth node and an eighth sensing element; the signal processing module is connected with at least one of the nodes; the first sensing element, the fourth sensing element, the fifth sensing element and the eighth sensing element have the same first magnetoresistance effect coefficient, and the second sensing element, the third sensing element, the sixth sensing element and the seventh sensing element are configured to have the same second magnetoresistance effect coefficient. The sensor circuit pr