Repairing method, repairing device and construction tool for joint of marine water intake box culvert

The invention discloses a repairing method, a repairing device and a construction tool for a joint of a marine water intake box culvert. According to the technical scheme, the repairing method is characterized by comprising the following steps that S1, an internal connecting steel plate and an external protective steel plate are arranged on the inner side and the outer side of the joint of the box culvert correspondingly, and the internal connecting steel plate and the external protective steel plate are relatively fixed, so that the internal connecting steel plate and the external protective steel plate are clamped and fixed to the two sides of the box wall of the box culvert; S2, composite protective cloth with counterweight strips is laid on the external protective steel plate, and then counterweight sand bags are arranged at the top and the two sides of the box culvert correspondingly to press and fix the composite protective cloth; and S3, the periphery of the composite protective cloth is filled with a