A jaw position detection apparatus is configured to detect position information of at least one jaw moving in an arc, and includes a connecting component, a conversion mechanism, and a displacement sensor. The connecting component is fixed on a jaw. The conversion mechanism is connected to the connecting component, and the conversion mechanism is configured to convert an arc motion of the connecting component into a linear motion when the connecting component moves in an arc with the jaw. The displacement sensor is connected to the conversion mechanism, and configured to detect displacement information of the linear motion of the conversion mechanism.