The invention discloses an air pressure sealed pressurizing belt type filtering machine. The filtering machine comprises a machine frame, a driving roller and a driven roller pivotally arranged on themachine frame, and an endless filter cloth wound between the driving roller and the driven roller, wherein a lower filtrate chamber is arranged on the machine frame, a feeding chamber is arranged ata corresponding position, a grid plate is fixedly arranged at the upper end of the lower filtrate chamber, a cylinder body with at least two air cylinders is on the machine frame and connected to themachine frame, and piston rods of the two air cylinders are connected to the feeding chamber; and the filtering machine also comprises a multi-process pipeline, and the multi-process pipeline comprises a slurry inlet communicating with a slurry conveying pipeline, a washing liquid inlet communicating with a washing liquid pipeline, and an air inlet communicating in parallel with a high-temperaturedry air drying pipeline and a high-pressure air pressure pipeline, one or more multi-process outlets communicating with the feeding chamber, and solenoid valves are respectively arranged on the slurry conveying pipeline, washing liquid pipeline, high-temperature dry air drying pipeline and high-pressure air pressure pipeline to control respective opening and closing. According to the filtering machine, leather belt or caterpillar band conveying is not needed, and the structure is simplified.