The invention discloses an integral type elliptical water tank and a molding process thereof. The integral type elliptical water tank comprises a tank body; the tank body is molded by rolling an external skin plate; the section of the tank body is in an oval shape; end plates are welded at the two ends of the tank body; swash plates are welded in the tank body; a cover plate is welded at the upperpart of the tank body; two straps are arranged on each swash plate in a matched manner. According to the integral type elliptical water tank, a process of molding the water tank body and the end plates through rolling at one time is mainly adopted, and a bottom abutting welding joint of the water tank body is eliminated, the structural strength of the end plates is enhanced; and the structures ofthe swash plates are optimized and adjusted to replace traditional structures. According to the integral type elliptical water tank, water supply equipment in a traditional water supply sanitation system adopted by big passenger trains, inter-city and city D-series high-speed trains, high speed trains and the like is changed; due to the implementation of a technological measure, problems of waterleaking, deformation, water tank swash plate shaking, difficult cleaning and the like of a traditional water supply equipment of a train water storage tank are solved; the normal operation of the train is prevented from being affected by a fault of electric equipment or the water supply sanitation system caused by water leakage of the water tank in operation.