Swing arm structure of engineering vehicle and engineering vehicle

The invention relates to the field of engineering machinery, and discloses a swing arm structure of an engineering vehicle and the engineering vehicle. The swing arm structure comprises a connecting plate (11), a wheel part (30), a wheel supporting piece (44) and a connecting base (41). The wheel part (30) is installed at one end of the connecting base (41) through a bearing so that the wheel part(30) can rotate around the axis. A column (111) extending in the direction perpendicular to the upper surface of the connecting plate (11) is arranged on the upper surface of the connecting plate (11). The connecting base (41) is arranged on the column (111) in a sleeving mode and is supported on the connecting plate (11) so that the connecting base (41) can rotate around the axis of the column (111). The swing arm structure can provide flexible driving modes for engineering machinery, longitudinal driving can be realized, and transverse driving can also be realized. In addition, when the vehicle turns a corner, the