The invention discloses a grouting anchor connector with a detection hole, a grouting fullness detection method and a grout replenishing method. The grouting anchor connector adopts a pre-embedded corrugated pipe to form a hole, a grout outlet hole and a grouting hole are formed in the surface of the corrugated pipe, a blocking plate is arranged at the upper end head of the corrugated pipe, and the blocking plate is provided with the detection hole. The grouting fullness detection method comprises the steps that a probe pipe line and a water injection hose of an industrial endoscope are extended into the corrugated pipe from the detection hole, through the cooperation of the industrial endoscope, a syringe and the water injection hose, grouting defects inside the corrugated pipe are subjected to endoscopic water injection, and the grouting fullness is determined. The grout replenishing method comprises the steps that a grout output channel is drilled to enable the grout output channelto be through, replenishing grouting is carried out from the grout output channel, and grout is output from a detection channel. The grouting anchor connector with the detection hole is reasonable instructure and easy to prepare, and the detection hole can realize dual purposes to facilitate follow-up detection and repair; and the grouting fullness detection method and the grout replenishing method have the advantages of high measuring speed, high precision and low comprehensive cost.