A signal acquiring device, including: a sensor, a signal converter and a signal transmitter, wherein the sensor is connected with the signal converter that is connected with the signal transmitter, and the sensor, the signal converter and the signal transmitter are all disposed on the body of a virtual reality apparatus; the sensor is used to detect action signals of the part of the wearer on which the virtual reality apparatus is worn, the signal converter is used to convert the action signals into electrical signals, and the signal transmitter is used to send the electrical signals to the virtual reality apparatus. The device has a high accuracy and improves experience of the wearer. A virtual reality apparatus and a control method thereof are also provided.