The utility model relates to a water injection well packer which mainly solves the problems that the rubber tube of an existing water injection well packer has the problems of easy damage and bad seal effect. The water injection well packer is characterized in that the number of middle rubber tubes (3) is 2, a spacing ring (4) is arranged between the middle rubber tubes (3), and the differences of the outer diameters of the rubber tubes (2,3) and a tube body (5) are negative. The water injection well packer has the characteristics of protecting the rubber tubes from being damaged and having excellent sealing effect.