Abstract: A speed display device includes a wearing unit to which a display unit is connected. The display unit has a lighting module. A satellite positioning unit is connected to the wearing unit and the display unit. The satellite positioning unit has a processing module which is wirelessly connected with a global satellite system and receives at least one position-time signal of the wearing unit from the global satellite system. The processing module calculates a movement speed of the wearing unit according to the at least one position-time signal, and the movement speed is displayed by the lighting module. The drivers behind the wearer are acknowledged the clear and precise speed information to avoid from making a wrong judgment.