Concrete conveying device and concrete pump truck

The utility model discloses a concrete conveying device and a concrete pump truck, and aims to solve the problems that a concrete conveying device in the prior art is large in occupied space requirement, low in flexibility, incapable of meeting high operation efficiency and high in abrasion degree, and consequently maintenance cost is increased. The conveying device comprises at least two knuckle arms, the side edge of each knuckle arm is correspondingly provided with a conveying pipe, every two adjacent knuckle arms are connected in an inserted mode, and every two adjacent conveying pipes are connected in an inserted mode. The knuckle arms comprise the first-stage knuckle arm and the second-stage knuckle arm which are different in diameter, a driving connector is assembled at the end of the first-stage knuckle arm, and the second-stage knuckle arm penetrates through the driving connector to be connected with the first-stage knuckle arm in an inserted mode. The conveying pipe comprises a fixed pipe, a first-s