Land open caisson construction process

The invention discloses a land open caisson construction technology, and relates to the technical field of buildings. The construction technology comprises the following steps that S1, foundation replacement and filling are conducted, specifically, the excavation depth of the open caisson is determined, and a gravel replacement and filling reinforcing method is adopted to conduct reinforcing treatment on a surface soft layer; s2, steel shell concrete construction, specifically, concrete is symmetrically cast in the steel shell open caisson, and after construction of the first section of steel shell concrete is completed, the second section of reinforced concrete and the third section of reinforced concrete are sequentially and symmetrically constructed and heightened; s3, primary dewatering and drainage sinking: after the concrete of the well wall reaches the design strength, taking soil and sinking to a preset elevation by adopting a dewatering and drainage sinking process, and continuously dewatering the ou