A phase shift control circuit for a multi-channel system including a pulse control circuit and a current matching circuit is provided. The pulse control circuit includes first to third transistors, a front operational amplifier, comparers, a current mirror circuit, clock switch circuits and pulse generating circuits. The front operational amplifier has two input terminals connected to a voltage divider circuit and an output terminal of the first transistor respectively, and an output terminal connected to control terminals of all the transistors. One input terminal of the comparer is connected to an output terminal of the third transistor, and another input terminal of the comparer is connected to the output terminal of the first transistor or a reference voltage source. The pulse generators are connected to the comparers and the clock switch circuits respectively. The current mirror circuit is connected to the current matching circuit.