Open caisson sinking depth measuring mechanism and method for suspension bridge

The invention belongs to the technical field of open caisson platforms, and particularly relates to an open caisson sinking depth measuring mechanism and a method for a suspension bridge. The open caisson sinking depth measuring mechanism comprises an installation frame installed on an open caisson platform through bolts, the cross section of the installation frame is in an L shape, placing frames are fixedly installed on the front face and the back face of the installation frame through bolts, a height lifting mechanism is fixedly installed on the bottom surface of the inner side of the placing frame. According to the open caisson sinking depth measuring mechanism and method for the suspension bridge, by arranging a height lifting mechanism, a fixing mechanism and a sludge surface contact mechanism, the height lifting mechanism firstly drives an elbow and a sludge suction steel pipe to ascend and descend, when the lower ends of the sludge suction steel pipe, an auxiliary sludge suction pipe and a sludge cont