The invention discloses a buoyancy self-control type inverted siphon and a construction process thereof, and belongs to the field of pipelines. The buoyancy self-control type inverted siphon comprises a pipeline body, the pipeline body comprises a pipeline support body, the outer end of the pipeline support body is coated with a pipeline protection interlayer, and the outer end of the pipeline protection interlayer is fixedly connected with a vacuum water suction cavity; the outer end of the vacuum water suction cavity is fixedly connected with a waterproof protective layer, the outer end of the waterproof protective layer is fixedly connected with a pipeline outer surface protective layer, and the vacuum water absorption cavity is matched with the pipeline outer surface protective layer, so that the inverted siphon effectively absorbs water in a self-service manner in the construction process, the self-weight is increased, and therefore the blocking of buoyancy is reduced; and automatic sinking of the inverted siphon is effectively realized, the operation is simple and convenient, the construction efficiency is improved, the construction of constructors is effectively facilitated, the use of auxiliary parts is effectively reduced, the construction cost is reduced, and the economic benefit of the inverted siphon is effectively improved.