Uplink data timing synchronization method

The invention discloses an uplink data timing synchronization method. The method comprises: a, for any UE, each RRU under the same BBU individually receiving the uplink signals of the any UE, according to the received uplink signals, selecting valid RRUs, and selecting a reference RRU from all the valid RRUs; b, according to the uplink signals received by the reference RRU, determining to send an initial lead TA; and c, estimating the delay inequalities between the uplink signals reaching the reference RRU and the uplink signals reaching each valid RRU as peak value delay inequalities of each valid RRU; setting the peak value delay inequalities of invalid RRUs as zero; and applying the peak value delay inequalities of each RRU and the TA to the uplink signal reception for the next time for the any UE by corresponding RRUs. By using the method provided by the invention, uplink data synchronization reception among the different RRUs can be realized.