Swing arm for pump truck

The utility model discloses a swing arm for a pump truck, which belongs to the field of swing arms and comprises a fixed bottom box, two transverse plates are fixedly mounted at the upper end of the fixed bottom box, a first hydraulic pump is fixedly mounted in an inner cavity of the fixed bottom box, a first rotating shaft is fixedly mounted between the two transverse plates, and the first rotating shaft is rotatably connected with a rotating rod. The output end of the first hydraulic pump is connected with a rotating rod through a snake neck pipe, a hanging hole is formed in the end, away from the first rotating shaft, of the rotating rod, a supporting block is fixedly installed at the lower end of the rotating rod, a second rotating shaft is fixedly installed on the supporting block, and the second rotating shaft is rotationally connected with a supporting rod. The extension rod can be conveniently extended, so that the included angle between the supporting rod and the rotating rod can be adjusted, the rot