Constructing method for self-elevating platform

The invention discloses a constructing method for a self-elevating platform. The self-elevating platform comprises an installation platform, a conical component, a pile shoe assembly, a pile leg assembly and a surrounding well. A first containing space and a second containing space are formed in the surrounding well. An interval is formed between the surrounding well and the installation platform. The conical component and the pile shoe assembly are provided with connection areas and non-connection areas. The constructing method comprises the following steps that the pile shoe assembly is hoisted into the second containing space and arranged in the installation platform; the pile leg assembly is hoisted into the first containing space, and the connection area of the pile leg assembly slides into the interval and is located in the position opposite to the pile shoe assembly; the connection area of the pile leg assembly is connected to the pile shoe assembly; the pile shoe assembly is hoisted away from the installation platform, and the connection area of the conical component is connected to the pile shoe assembly; and the pile shoe assembly descends to the bottom of the non-connection area of the conical component and is arranged on the installation platform. The problem of insufficient welding space is solved, flexibility and safety of construction are improved, the cost is reduced, and the welding quality is improved remarkably.