The utility model discloses an on -vehicle gas detection gas sample collection system, including the sensor, still including collection pipe, air sampling pump, locomotive, air sampling pump utilizesthe air inlet intercommunication of self to gather the pipe, and air sampling pump utilizes the gas outlet of self to connect the sensor, sensor, air sampling pump, collection pipe are all fixed on the locomotive. Gather the pipe including the collection house steward and collection branch pipe that are connected. It has seted up the air sampling pump connector and has gathered the branch connection mouth to gather house steward. The collection house steward passes through the support and fixes on the locomotive. It is nonrust steel pipe to gather house steward. It sets up 2 at least to gatherthe branch pipe to antithetical couplet formula intercommunication is on gathering house steward. The collection branch pipe is the hose, and the port passes through the quick connector connection ongathering house steward behind the hose. The safety cover that the port installation has the gas permeability before the hose. The safety cover adopts the polyethylene macromolecular material. The utility model discloses realize high -efficient accuracy and patrol and examine, widen the range of security monitoring.