The invention discloses a clock correction method. The method comprises the following steps: measuring the time for transmitting a signal between a master clock node and a slave clock node, and determining the signal transmission time corresponding to the slave clock node; determining the delay processing time corresponding to the slave clock node, so that the sum of the delay processing time corresponding to each slave clock node and the signal transmission time is the same; sending the time delay processing time corresponding to the slave clock node to the slave clock node; and sending working clock setting information to the slave clock node, wherein the working clock setting information is used for indicating the slave clock node to set a working clock according to the delay processingtime corresponding to the slave clock node. The clock correction method provided by the invention ensures that each slave clock node starts the respective working clock timing at the same time afterbeing subjected to the corresponding delay processing time, that is, clock synchronization is realized between various slave clock nodes. In addition, the invention further discloses a clock correction device and system.