Head-mounted vr all-in-one machine

A head-mounted Virtual Reality (VR) device, comprising:

• an Inertial Measurement Units (IMU) sensor and a front cover plate, wherein four first tracking cameras are disposed on an outer frame of the front cover plate;
• two second tracking cameras, one is disposed near user's left eyes on an inner side of the front cover plate and another is disposed near user's right eyes on the inner side of the front cover plate;
• and a third tracking camera is disposed near user's mouth at a bottom of the front cover plate, wherein
• the four first tracking cameras and the IMU sensor constitute a user head six Degree of Freedom (6 DoF) tracking module, the two second tracking cameras constitute a user eye tracking module, the two second tracking cameras and the third tracking camera constitute a user facial expression recognition module, and the four first tracking cameras are multiplexed to constitute a user hand recognition and tracking module.