The invention discloses an online automatic inspecting machine of punching of six holes of a holder. The online automatic inspecting machine is characterized by comprising a local deformation and burr out-of-tolerance detecting mechanism fixed on a seat board, a six-hole size and shape and position out-of-tolerance detecting mechanism, a motor rack, a first bearing seat bracket, a second bearing seat bracket, a control box and a friction belt synchronous transmission mechanism, wherein the friction belt synchronous transmission mechanism is arranged on the motor rack, the first bearing seat bracket and the second bearing seat bracket; a lead in the local deformation and burr out-of-tolerance detecting mechanism, a sensor lead in the six-hole size and shape and position out-of-tolerance detecting mechanism and a power lead of a speed reducing motor in the friction belt synchronous transmission mechanism are connected into the control box, the control box is fixed on the seat board on the rack, and a protection cover covers the six-hole size and shape and position out-of-tolerance detecting mechanism. The online automatic inspecting machine is reasonable in structure and accurate to detect, ensures product quality, and can be used for preventing mechanical failure accident in the next procedure from occurring.