A system and method for transmitting seamless wireless data in real time are disclosed. The system includes a transmission device for transmitting wireless data to a reception device in real time. The transmission device includes a packet transmission unit, a communication efficiency detection unit, and a transmission cycle adjustment unit. The packet transmission unit transmits a data packet to the reception device. The communication efficiency detection unit detects communication efficiency of the packet transmission. The transmission cycle adjustment unit adjusts a cycle of the packet transmission according to the detected communication efficiency. It is possible to efficiently transmit seamless wireless data in real time even in a wireless space of a communication environment which varies continuously by continuously monitoring the communication environment of the wireless space where the wireless data is transmitted and adjusting the setting of a communication system to be suitable for the monitored wireless environment.