The present invention is connected to the faucet to supply water to the reservoir to the end of the intake hose to form an expansion connection having a two-diameter (異徑) structure to be combined corresponding to the size and shape of the faucet formed in a variety of diameters, By installing a water inlet between the water supply hose for supplying water from the reservoir to the pot and the water intake hose for supplying water to the water reservoir, the water supply injection nozzle and the water intake connector can be alternately used as necessary. If the water supply is insufficient while using the water supply hose, the diameter of the mobile water supply that allows water to be taken directly through the water supply hose attached to the existing water supply without using a separate hose or tool. It relates to a water intake connection structure having a structure. In order to achieve the above object, the present invention provides a water intake hose 10 having one end connected to the faucet and the other end connected to the connection socket 11 to supply water to the mobile water supply 1; One end is connected to the mobile water supply (1) to supply water to pots, etc., and the other end is connected to the water supply hose 20 is coupled to the injection nozzle 22 for supplying water and the connection socket 21 for connection installation and ; The connection socket 11 of the intake hose 10 and the connection socket 21 of the water supply hose 20 is composed of a connector 30 for connecting the intake hose 10 and the water supply hose 20, An expansion connection portion 10a having a two-diameter structure is formed at an end of the intake hose 10 connected to the faucet to supply water to the water reservoir so that it can be applied to a faucet formed in various sizes and shapes. The connector 30 is left and right around the central plate 30 'so as to be inserted into and coupled to the respective connecting sockets 11 and 21 coupled to the intake