Pump truck chassis and pump truck

The utility model provides a pump truck underframe and a pump truck, and the pump truck underframe comprises an installation assembly used for installing a supporting leg mechanism of the pump truck; the lower cover plate weldment is connected with the lower end face of the mounting assembly; and the rotary table connecting piece comprises a clamping cylinder and a mounting ring located at the upper end of the mounting assembly, the clamping cylinder is provided with a clamping groove allowing the mounting assembly to penetrate through and be clamped, and the clamping cylinder axially extends from the mounting ring and is located between the mounting ring and the lower cover plate weldment. According to the embodiment, the mode that the rotary table connecting piece penetrates through the installation assembly and is connected with the lower cover plate is avoided, the length of the rotary table connecting piece can be shortened, the weight is greatly reduced, light weight is achieved, and meanwhile transfer