Swing mechanism for machining inclined hole of cylinder cover and machine tool

The utility model discloses a slewing mechanism and a machine tool for machining an inclined hole of a cylinder cover, the slewing mechanism comprises a base, a slewing table, a mandrel, a positioning assembly, a locking assembly, a drill jig and a second positioning piece, and the slewing table is used for fixedly arranging the cylinder cover; the rotary table is connected with the base through the mandrel; the positioning assembly is connected with the base and comprises a first positioning piece, and the first positioning piece is connected with the rotary table in an inserted mode; the locking assembly is connected with the base, the locking assembly comprises a jacking piece, the jacking piece is located between the base and the rotary table, and the jacking piece is used for fixing the rotary table; the drill jig is used for being fixedly arranged on the air cylinder cover, and a plurality of guide holes are formed in the drill jig. And the drill jig is positioned with the cylinder cover through a secon