The embodiments of the invention relate to the field of wireless communications, and disclose a data sending and receiving method and device, for saving system transmission symbol resources and ensuring correct data transmission. When a sending end sends signals through transmission symbols in a subframe, same data is transmited over an n-th transmission symbol and a k-th transmission symbol of the subframe, and a receiving end obtains the complete data through combining part of the data, transmitted by the two transmission symbols. By using the method and device provided by the invention, the system transmission symbol resources can be saved, and the correct data transmission can be ensured.