Vehicle mounted negative pressure toilet system

The utility model relates to a vehicle mounted negative pressure toilet system. The technical problem the utility model is to solve is to provide a vehicle mounted negative pressure toilet system which can both save a great deal of water resource and deodorize bad smell to keep air in compartment clean. The technical proposal of solving the problem is that high-pressure gas exported by a volt box respectively supplies a pressure water tank, a diaphragm pump electromagnetic valve and a faeces collecting box electromagnetic valve with gas; and water exported by the volt box respectively supplies a handrinse basin and a bedpan with water via an induction electromagnetic valve and an electromagnetic valve. The output pipeline of the bedpan and one tightening angle valve of the diaphragm pump are mutually connected, the other tightening angle pump and the faeces collecting box are mutually connected, and the cylinder of the diaphragm pump and the diaphragm pump electromagnetic valve are mutually connected. A diaphragm pump body is provided between the cylinder and the tightening angle pump, the faeces collecting box and the electromagnetic valve of the faeces collecting box are connected via a pneumatic blowoff valve, a switch in a driving cap and the electromagnetic valve of the faeces collecting box are connected mutually, and a switch for guest use positioned near the bedpan and a master control board are connected. The master control board and each electromagnetic valve are uniformly energized by an accumulator. The utility model can be used in automobile, train and public convenience.