The invention relates to a projection device and a projection system comprising the same. The projection device can be connected to a server for sending a time signal through a network; the projection device comprises a setting module, a timing module and a network processing module; the setting module is used for storing a setting message; the timing module is used for generating a time message; and the network processing module is coupled to the setting module and the timing module, used for responding the setting message and the time message, and connected to the server through the network in specific time to acquire the time signal, so that the timing module can respond to the time signal acquired by the network processing module and correct the time message.