Abstract: The present disclosure provides a square water cup, including a cup cover assembly and a cup body; the water cup of the present application further meets requirements of a user by achieving stable connection between the cup cover and a rectangular cup mouth; and matching between a limiting groove in a sealing cover and a limiting member of a lower cover of the present application achieves limitation on a rotation range of the cup cover, and further ensures the safety in use; meanwhile, simple structural design also facilitates the use and assembly of the product; and the square water cup of the present application can further improve the use experience and safety protection for the user.