The present application discloses a method and apparatus for adjusting a train diagram, the method includes: obtaining a first time of an extra train corresponding to a target passenger flow, and obtaining a set of trains with adjustable departure times based on the first time, in which the set of trains includes at least one train; adjusting a departure time of the at least one train in the set of trains based on a preset minimum departure time interval to obtain an adjusted train diagram; and performing an extra train adding instruction based on the adjusted train diagram.