Provided are a method and apparatus for processing a deterministic networking (DetNet) data packet. The method includes: performing, by a DetNet node, format encapsulation on a data packet of a DetNet application flow when the DetNet application flow passes through a multiprotocol label switching (MPLS) network, wherein an encapsulated data packet comprises a label indication and a flow identifier header; and forwarding the encapsulated data packet in the MPLS network.