The utility model discloses a locating structure used between flow guide bodies of a charging pump. The flow guide bodies comprise a plurality of sections of connected unit flow guide bodies with radial subdivision structure. Corresponding locating pin holes and connecting through holes are respectively and radially arranged on the front and rear end faces of each section of unit flow guide body, and each section of unit flow guide body is radially located through the locating pin hole on the rear end face of the previous section of unit flow guide body corresponding to the pin hole on the rear end face of the next section of unit flow guide body via pins and is locked via tightening studs and nuts penetrating through the connecting through holes. In the locating structure used between flow guide bodies of a charging pump, the quantity of parts required for connection is greatly reduced, only nuts on the tightening studs need to be loosened during maintenance, the flow guide bodies can be convenient to clean, and the flow guide bodies are very convenient and simple to inspect and assemble.