The invention provides a V-shaped water-collecting upflow sedimentation tank, and relates to wastewater equipment. The V-shaped water-collecting upflow sedimentation tank consists of a sedimentation tank main body enclosed by the wall of the tank, a V-shaped water collecting tank fixed at the center of the sedimentation tank main body and a water inlet device arranged around the sedimentation tank main body. The V-shaped water-collecting upflow sedimentation tank is characterized in that the water inlet device comprises a water inlet groove, a water passing hole arranged on the wall of the tank, a rectifier tank connected with the water inlet device, a water distribution tank which has the same bottom and the height as the rectifier tank, a downflow weir arranged in the middle of the rectifier tank and the water distribution tank, and a flow guide pipe of which one end is arranged at the bottom of the water distribution tank. A sludge hopper is arranged at the bottom of the sedimentation tank main body, and the lower part of the sludge hopper is provided with a sludge removing pipe; and the V-shaped water distribution tank is provided with a water outlet pipe. By changing a water inlet mode and a water outlet mode, the V-shaped water-collecting upflow sedimentation tank can reach the surface load which is equal to the inclined plate (pipe) sedimentation tank without an additional inclined plate (pipe), and is wide in application range, and convenient to run and maintain.