Cofferdam supporting structure for water conservancy and hydropower construction

The invention relates to the technical field of water conservancy projects, and discloses a water conservancy and hydropower construction cofferdam supporting structure which comprises a plurality of splicing steel plates for splicing, inserting cabins are fixedly connected to the positions, located in the concave positions, of the splicing steel plates, conical heads are fixedly connected to the bottoms of the inserting cabins, and inserting grooves are formed in one sides of the inserting cabins; the splicing steel plate comprises a splicing steel plate body, a slot is formed in the splicing steel plate body, an inserting plate is inserted into the slot, the slot is divided into three stages of gentle, first-stage deformation and second-stage deformation so that the inserting plate can be inserted outwards, the splicing steel plate body can be supported, the two sides of the splicing steel plate body are in a step shape, and inserting grooves are formed in the outer side wall of the splicing steel plate bod