A method and a system for processing a data conflict are provided that relate to the field of signal interface technologies of an integrated circuit, where the method includes sending a power management bus (PMBus) command to a slave device by using a PMBus, so as to perform power management; when the PMBus command fails to be sent, determining whether the number of times that the PMBus command fails to be sent is greater than or equal to a preset value, where the preset value is configured in advance during system initialization; starting timing if the number of times that the PMBus command fails to be sent is less than the preset value; and resending the PMBus command when timing duration reaches resending time. The present invention is applicable to a scenario in which multiple master devices (Masters) send the PMBus command by using the PMBus.