The invention discloses a CFG pile driver quality monitoring system which comprises a horizontal chassis. Bosses are arranged on two sides of the horizontal chassis, hydraulic supporting legs are installed on the bosses, a supporting frame is installed at one end of the horizontal chassis through a hinge base, a hydraulic telescopic rod and a reinforcing connection rod are connected between the supporting frame and the horizontal chassis through hinges, the reinforcing connection rod is located on the upper side of the hydraulic telescopic rod, and a first motor is installed in the middle of the horizontal chassis. The CFG pile driver quality monitoring system conducts accurate positioning on a construction site by controlling an RTK attitude instrument receiver in a box, prevents the problem that a deviation exists between a construction position and an actual position, makes the horizontal chassis always kept in a horizontal state by detecting a state of the horizontal chassis through a level gauge, detects the loosing degree of a steel rope based on current change of a first ampere meter, accordingly controls the sinking speed of a drill rod, reduces noise and shake in the construction process, improves pile forming quality and detects the rotating speed of the drill rod based on the current change of a second ampere meter.