The utility model discloses a concrete pump truck which comprises an inner supporting leg, a supporting leg channel and a hydraulic cylinder. The concrete pump truck further comprises a first reinforcing plate and a limit stop, the first reinforcing plate is fixedly arranged on the inner supporting leg and moves along with the inner supporting leg, and the limit stop is fixedly arranged on the supporting leg channel and located at the maximum movement stroke position of a piston rod of the hydraulic cylinder so as to stop the first reinforcing plate. According to the concrete pump truck, by the arrangement of the first reinforcing plate and the limit stop, the inner supporting leg can be prevented from moving inertially in time. Meanwhile, inertia generated when the inner supporting leg moves is transmitted to the supporting leg channel, the hydraulic cylinder is prevented from being impacted from inertia, and the service life of the hydraulic cylinder is prolonged effectively.