Provided are a time correction method and a time correction apparatus for a slave clock device. The method is applied to a slave clock device, wherein the method includes: acquiring background traffic information, in a running process, of the slave clock device; acquiring a deviation correction value according to the background traffic information and a fitted function reflecting delay on an asymmetric link; and correcting a synchronization time, which is output from the slave clock device, in real time according to the deviation correction value. With the above technical solution, the technical problem in related art that there is no technical solution for effectively eliminating a dynamic delay change of an asymmetric link due to a background traffic change is solved, thereby greatly reducing the impact of the traffic change on the asymmetric link delay.