Onboard temporary supporting device of fully-mechanized excavating machine

A vehicle-mounted temporary supporting device of a fully-mechanized excavating machine is characterized in that a tooth type rotation driving assembly is fixedly arranged on the outer circumference ofthe front end of a cutting reduction gearbox, a vertical plate is vertically arranged on the upper end face of the tooth type rotation driving assembly, forepoling bars are symmetrically hinged to the front end face of the vertical plate, and hydraulic oil cylinders A are symmetrically hinged to the front side of the vertical plate; a middle shaft is rotationally arranged on the inner side wall between the forepoling bars, the far end of the forepoling bars is hinged to the middle of the shovel plate, a hydraulic oil cylinder B is hinged to the shovel plate and above the forepoling bars, andthe other end of the hydraulic oil cylinder B is fixedly arranged on the middle shaft. The hydraulic forepoling supporting device has the advantages that the defects in the prior art are overcome, thehydraulic forepoling suppo