A source drive circuit, a liquid crystal display panel and a method for driving the same are disclosed. The source drive circuit comprises a data temporary storage module used for generating a first driving signal based on a digital image signal; a digital to analog converting module used for performing digital to analog conversion on the first driving signal so as to obtain a first analog image signal; a buffering and amplifying module used for amplifying the first analog image signal so as to obtain a second analog image signal; and a screen cleaning module used for pulling down a signal output by the buffering and amplifying module according to a source selection signal, so that charge coupled with liquid crystal is released. In the source drive circuit, charge coupled with liquid crystal of the In-cell liquid crystal display panel when the panel is in a standby state due to touch detection scanning thereof can be effectively cleaned, and the case that the liquid crystal is polarized since it has a same polarity for a long time can be avoided.