This application discloses a packet loss positioning method, apparatus, system, and a computer storage medium, and belongs to the field of network technologies. A network device obtains an identifier of a target traffic flow, where the target traffic flow is a traffic flow in which packet loss occurs on the network device. The network device generates packet loss information of the target traffic flow, where the packet loss information includes the identifier of the target traffic flow and an identifier of the network device. The network device sends the packet loss information to an analysis device, so that the analysis device determines a packet loss location of the target traffic flow.