Folding portable supporting device for soft soil foundation pit protection and supporting method thereof

The invention discloses a folding portable supporting device for soft soil foundation pit protection and a supporting method of the folding portable supporting device, and belongs to the technical field of folding portable supporting devices.The folding portable supporting device is characterized in that a rotating rod is rotated to enable a rotating pressing plate to be located at the bottom of a bottom hinge plate, and then an embedded pipe and a bottom cone plate are impacted again to be buried in the ground; an adjusting insertion rod is inserted into a pre-buried pipe, then a handheld handle is continuously impacted, the adjusting insertion rod is matched with an arc-shaped auxiliary block, so that a side insertion rod of the arc-shaped auxiliary block penetrates through a clamping hole to be in insertion type contact with the inner side face of the ground for stabilization, a stone protection belt is pulled out by pulling a top disc, and then a tip cone rod and a side auxiliary rod are inserted into the