A method for detecting a clock synchronization path, wherein the method comprises: generating, by a first node, a first synchronization detection request message, wherein the first synchronization detection request message comprises an identifier, ID, of the first node; sending, by the first node, the first synchronization detection request message to a second node; receiving, by the first node, a first synchronization detection response message sent by the second node, wherein the first synchronization detection response message comprises clock topology information of the second node and the ID of the first node; and obtaining, by the first node, a first detection result according to the first synchronization detection response message, wherein the first detection result is used to indicate a status of a clock synchronization path between the first node and the second node; wherein the sending, by the first node, the first synchronization detection request message to a second node comprises: sending, by the first node, the first synchronization detection request message to the second node by using a port used to transmit a clock synchronization signal, wherein the port used to transmit a clock synchronization signal is a port that is on the first node and that can transmit a clock synchronization signal to the second node; wherein the first synchronization detection request message further comprises a first synchronization type, the first synchronization type is used to represent frequency synchronization, and the first synchronization detection request message is used to request to detect a frequency synchronization path; and the sending, by the first node, the first synchronization detection request message to the second node by using a port used to transmit a clock synchronization signal comprises: determining, by the first node according to the first synchronization type in the first synchronization detection request message and the port used to transmit a clock synchronization signal, a port used to transmit a frequency synchronization signal, wherein the port used to transmit a frequency synchronization signal is a port that is on the first node and that can transmit a frequency synchronization signal to the second node; and sending, by the first node, the first synchronization detection request message to the second node by using the port used to transmit a frequency synchronization signal. generating, by a first node, a first synchronization detection request message, wherein the first synchronization detection request message comprises an identifier, ID, of the first node; sending, by the first node, the first synchronization detection request message to a second node; receiving, by the first node, a first synchronization detection response message sent by the second node, wherein the first synchronization detection response message comprises clock topology information of the second node and the ID of the first node; and obtaining, by the first node, a first detection result according to the first synchronization detection response message, wherein the first detection result is used to indicate a status of a clock synchronization path between the first node and the second node; wherein the sending, by the first node, the first synchronization detection request message to a second node comprises: sending, by the first node, the first synchronization detection request message to the second node by using a port used to transmit a clock synchronization signal, wherein the port used to transmit a clock synchronization signal is a port that is on the first node and that can transmit a clock synchronization signal to the second node; wherein the first synchronization detection request message further comprises a first synchronization type, the first synchronization type is used to represent frequency synchronization, and the first synchronization detection request message is used to request to detect a frequency synchronization path; and the sending, by the first node, the first synchronization detection request message to the second node by using a port used to transmit a clock synchronization signal comprises: determining, by the first node according to the first synchronization type in the first synchronization detection request message and the port used to transmit a clock synchronization signal, a port used to transmit a frequency synchronization signal, wherein the port used to transmit a frequency synchronization signal is a port that is on the first node and that can transmit a frequency synchronization signal to the second node; and sending, by the first node, the first synchronization detection request message to the second node by using the port used to transmit a frequency synchronization signal. determining, by the first node according to the first synchronization type in the first synchronization detection request message and the port used to transmit a clock synchronization signal, a port used to transmit a frequency synchronization signal, wherein the port used to transmit a frequency synchronization signal is a port that is on the first node and that can transmit a frequency synchronization signal to the second node; and sending, by the first node, the first synchronization detection request message to the second node by using the port used to transmit a frequency synchronization signal.