A clock drift processing method, comprising: obtaining, by a first network function element, a first drift amplitude value, the first drift amplitude value being a maximum value of a change amplitude of a clock difference between a first clock domain and a second clock domain, the first clock domain being a clock domain of a data network, and the second clock domain being a clock domain of a wireless network in which the first network function element is located; transmitting, by the first network function element, the first drift amplitude value to a second network function element, the first drift amplitude value being used by the second network function element to transmit a first notification message in a case of detecting that a first maximum drift value is greater than the first drift amplitude value, the first maximum drift value being a difference between a maximum clock difference and a minimum clock difference that are between the first clock domain and the second clock domain in a first time period, the first time period being a time period from a time instant at which the second network function element receives the first drift amplitude value to a time instant at which the first maximum drift value is greater than the first drift amplitude value; receiving, by the first network function element, the first notification message transmitted by the second network function element, the first notification message comprising a first clock difference, the first clock difference being a last clock difference between the first clock domain and the second clock domain that is acquired by the second network function element in the first time period, the last clock difference being a clock difference between the first clock domain and the second clock domain when the first maximum drift value is greater than the first drift amplitude value; determining, by the first network function element, first time sensitive communication assistance information TSCAI according to the first clock difference; and transmitting, by the first network function element, the first TSCAI to a radio access network RAN device, the first TSCAI being used by the RAN device to perform time control on a data stream in the first clock domain. obtaining, by a first network function element, a first drift amplitude value, the first drift amplitude value being a maximum value of a change amplitude of a clock difference between a first clock domain and a second clock domain, the first clock domain being a clock domain of a data network, and the second clock domain being a clock domain of a wireless network in which the first network function element is located; transmitting, by the first network function element, the first drift amplitude value to a second network function element, the first drift amplitude value being used by the second network function element to transmit a first notification message in a case of detecting that a first maximum drift value is greater than the first drift amplitude value, the first maximum drift value being a difference between a maximum clock difference and a minimum clock difference that are between the first clock domain and the second clock domain in a first time period, the first time period being a time period from a time instant at which the second network function element receives the first drift amplitude value to a time instant at which the first maximum drift value is greater than the first drift amplitude value; receiving, by the first network function element, the first notification message transmitted by the second network function element, the first notification message comprising a first clock difference, the first clock difference being a last clock difference between the first clock domain and the second clock domain that is acquired by the second network function element in the first time period, the last clock difference being a clock difference between the first clock domain and the second clock domain when the first maximum drift value is greater than the first drift amplitude value; determining, by the first network function element, first time sensitive communication assistance information TSCAI according to the first clock difference; and transmitting, by the first network function element, the first TSCAI to a radio access network RAN device, the first TSCAI being used by the RAN device to perform time control on a data stream in the first clock domain.