Three-dimensional extension demonstration device

The invention relates to a three-dimensional extension demonstration device. The demonstration device comprises a demonstration mechanism; the demonstration mechanism comprises a cube or cuboid-shapedmounting frame; a plane mirror is embedded in the inner side of each surface of the mounting frame; a semi-reflecting semi-transparent mirror is embedded in the outer side of each surface of the mounting frame; and an LED lamp strip arranged on the mounting frame is arranged in an interlayer between each plane mirror and each semi-reflecting semi-transparent mirror. According to the demonstrationdevice, by combining the plane mirrors and the semi-reflecting semi-transparent mirrors, which are arranged on the six surfaces, and the LED lamp strips, audiences can visually see three-dimensionallamplight demonstration images from the six surfaces of the cube or cuboid demonstration mechanism, namely, the demonstration device can enable the audiences to directly watch the extension display effect based on virtuality an