Concrete placing boom

The invention discloses a concrete placing boom, which comprises a walking base, a main column, a main revolving arm, an auxiliary revolving arm, a pipeline system, an end telescopic pipeline, a mainarm support leg, an auxiliary arm support leg and a control system. The concrete placing boom provided by the invention is characterized in that the walking base is utilized for satisfying the movement requirement of the whole machine; the two-stage revolving arms are utilized for rotating the end telescopic pipeline to the appointed pouring position; the telescopic ability of the end telescopic pipeline is utilized for ensuring the end telescopic pipeline to be withdrawn back synchronously during the pouring process; the distance between the discharge port of the end telescopic pipeline and the liquid level of concrete is enabled to be constant; and the main arm support leg and the auxiliary arm support leg are synchronous in adjustment to the height of the walking base for maintaining the horizontal level of the