The invention provides a channel deep suppressing foot fast construction method. The method includes the following steps that firstly, suppressing foot side boundary surveying and paying-off are conducted; secondly, a
pilot groove is excavated; thirdly, suppressing foot
pile position setting out is conducted; fourthly, primary stirring and sinking are conducted, stirring and sinking are only conducted to the design depth, and soil is loosened; fifthly, primary grouting, stirring and lifting are conducted, grouting is conducted from bottom to top, stirring is conducted at the same time, the
field soil and
cement paste are primary mixed, and part of the total
grout spraying amount is completed; sixthly, secondary stirring and sinking are conducted, and the fourth step is repeated; seventhly,secondary grouting, stirring and lifting are conducted, the fifth step is repeated, and the whole total
grout spraying amount is completed; and eighthly, the fourth step, the fifth step, the sixth step and the seventh step are repeated, the subsequent
pile position work is completed. By the adoption of the method, unprotected open
cut excavation work is effectively avoided, the technology is simplified, the cost is saved, the construction period is shortened, construction is safe, the structural strength is ensured, the requirement for the soil of a work area is extremely low, adaptability ishigh, and the method is worthy of being applied and popularized.