The present application relates to a timeslot negotiation method and a device. The method comprises: a network device TX of a transmitting end transmits a first Flex Ethernet (FlexE) overhead frame to a network device RX of a receiving end for requesting master/backup switching of a timeslot allocation table; when the RX is in a restart state, no response is made to the received first FlexE overhead frame. Moreover, the RX transmits a routinely refreshed second FlexE overhead frame to the TX, and the TX determines that the second FlexE overhead frame is not a response to the first FlexE overhead frame according to indication information carried in the second FlexE overhead frame. The TX transmits a third FlexE overhead frame, and requests master/backup switching of the timeslot allocation table again. According to the method, the TX can determine whether the received FlexE overhead frame is a response to a timeslot negotiation request sent by the RX to the TX. Therefore, the operation of erroneous switching of the timeslot allocation table of the TX due to the RX error response is avoided, and interruption of services caused by the existing timeslot negotiation mechanism can be effectively reduced.
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