Supporting leg device and concrete pump truck

The utility model discloses a landing leg device and a concrete pump truck, the landing leg device comprises a first-stage landing leg, a second-stage landing leg, a third-stage landing leg and a fourth-stage landing leg, a sliding rail is formed in an inner sliding groove of the first-stage landing leg, and a rolling mechanism protruding out of a sliding rail surface is arranged on the sliding rail; and the second-stage supporting legs extend out of the inner sliding grooves in a sliding mode and make rolling contact with the rolling mechanisms, falling of paint on the lower surfaces of the second-stage supporting legs can be effectively reduced, corrosion caused by paint falling is avoided, and the overall service life of the supporting leg device can be prolonged. 本实用新型公开了一种支腿装置和混凝土泵车，该支腿装置包括：一级支腿，一级支腿的内滑槽中形成有滑动轨道，滑动轨道上设有凸出于滑轨面的滚动机构；二级支腿，二级支腿从内滑槽中滑动伸出并与滚动机构滚动接触，能有效减少二级支腿下表面的油漆脱落，避免因油漆脱落产生锈蚀，有利于提升支腿装置的整体使用寿命。