The invention discloses a deceleration strip doubling as a flood-control blocking dam. The deceleration strip doubling as the flood-control blocking dam comprises a base, wherein a groove is formed in the top of the base; a turnover panel is flatly laid in the groove; a bracing rod is concealed in the turnover panel; the bracing rod can support the panel to stand up; the turnover panel is a rubber panel; the turnover panel is formed through splicing in a length direction; sealants are filled in concave-convex joint parts of the turnover panel; the turnover panel is fixed in the groove through a hinge; the bracing rod can be an elastic supporting body so that the angle between the turnover panel and the ground is not more than 45 DEG; the bottom of the base is provided with a soft rubber water-stop belt in a length direction of the base; the bracing rod is connected with the turnover panel through a hinge; the end part of the turnover panel is provided with a sealing rubber; and the sealing rubber is used for sealing a gap between the turnover panel and a wall body. According to the invention, the deceleration strip doubling as the flood-control blocking dam not only can be used as the automobile deceleration strips at garage or factory entrances but also can be used as the flood-control blocking dams; therefore, an effect that a material has multiple functions is realized and the material utilization efficiency is greatly increased.