The present disclosure discloses a driving circuit for a source driving chip. In the driving circuit for a source driving chip, an output terminal of the blanking timer is connected to a control terminal of the switching unit; an input terminal of the switching unit is connected to a power supply source; an output terminal of the switching unit is connected to a supply terminal of the buffer amplifier. The blanking timer is used to generate a control signal; wherein, the control signal is a first voltage level during a row blanking interval or a frame blanking interval; the control signal is a second voltage level during the row non-blanking interval or the frame non-blanking interval. The driving circuit for a source driving chip of the present disclosure can effectively reduce the power consumption.