The invention discloses a pile jetting device of a self-lifting drilling platform. The pile jetting device of the invention comprises a pile jetting pump, a pile jetting pipeline, a washing pipe, a protective hood, a pile jetting valve and a hydraulic control device, wherein, the pile jetting valve is arranged in the bottom plate of a pile shoe; the input terminal of the pile jetting valve is connected with the pile jetting pipeline while the output terminal is connected with the washing pipe; the pile jetting valve controls the on-off of the pile jetting valve by the hydraulic control device. As the pile jetting device of the invention arranges a controllable valve body structure between the pile jetting pipeline and the pile jetting pipe, during the pipe jetting, the hydraulic control device can control the valve body to be opened to carry out the pile jetting and to be closed when the pile jetting is finished, thus preventing the blockage of the pipeline due to the entry of silt inthe pile jetting pipe during the courses of pile pitching and drilling. In addition, the pile jetting device of the invention can arrange the pile jetting valve to each jetting pipe respectively and control each pile jetting valve individually by the hydraulic control device so as to determine reasonable quantity of water and time for the pile jetting according to the distribution of the jetting pipe.