The present invention discloses a nuclear fuel assembly repair detection control system, which is used for detecting whether a nuclear fuel assembly is damaged and repairing the monitoring during the damaged nuclear fuel assembly work, and comprises a video detection device and a monitoring device, wherein the video detection device collects the video image in the monitoring work, and the monitoring device is respectively connected with the video detection device, a pulling force sensor (on a nuclear fuel rod drawing-inserting tool) and a cable encoder (on a new fuel elevator). According to the present invention, the action of the video detection device can be controlled, the video image collected by the video detection device can be displayed, the works of the nuclear fuel rod drawing-inserting tool and the new fuel elevator can be monitored through the pulling force data and the height data detected by the pulling force sensor (on the nuclear fuel rod drawing-inserting tool) and the cable encoder (on the new fuel elevator), and the operator can be reminded in case of failure, such that the operator can complete the whole monitoring work through the monitoring device, the operation is simple, the operation safety is good, and the repair efficiency is high.