Grinding and rust removing device for steel structure surface

The invention relates to the technical field of steel structure polishing, in particular to a steel structure surface polishing and derusting device which comprises a base and a supporting box, the supporting box is fixedly installed on the base, and a sliding opening is formed in the upper side of the supporting box; the approaching mechanism is installed on the supporting box, the power output end of the approaching mechanism penetrates through a sliding opening formed in the supporting box and is fixedly connected with two groove bodies; the fixing mechanism is fixedly installed in the middle of the upper side of the supporting box, and the steel structure can be fixed through the fixing mechanism; the reciprocating mechanism is installed on the groove body and engaged with the fixing mechanism, and a connecting rod is fixedly arranged on the reciprocating mechanism; and the push-down mechanism is installed at the upper ends of the two groove bodies, and the polishing mechanism is installed on the push-dow