The utility model provides a solar water heater which comprises a vacuum heat-collecting tube and a water storage tank, wherein the water storage tank comprises a liner, an interlayer liner, an insulated layer and a water storage tank outer casing sequentially and tightly attached and arranged from inside to outside, and heat exchange medium is respectively arranged in the vacuum heat-collecting tube and the interlayer liner. The solar water heater is characterized by also comprising a connexion box connected with the vacuum heat-collecting tube, both opposite sides of the connexion box are respectively connected with one end of an upper connexion pipe and one end of a lower connexion pipe, and the other end of the upper connexion pipe and the other end of the lower connexion pipe are connected with the interlayer liner. On the basis of a traditional direct-insertion bearing water heater, the connexion pipes of the water heater are respectively arranged at the upper side and the lower side of the connexion box to be connected with the interlayer liner between the liner and the insulated layer and form a circulating passage so that the heat exchange medium can enter the interlayer liner by the connexion box and the connexion pipes to heat water in the liner to increase the heating area, have insulation function and improve the heating and insulation effects.