The utility model discloses a standpipe of a water surge relief inlet tank. The standpipe is expected to reduce the flushing of the surge fluid over a relief tank body, and protect the tank body from being damaged. A diffusion standpipe and a fluid climbing standpipe are both fixed on the bottom of the relief tank body, and a bend pipe on the tops of the two standpipe is connected through flanges. The diffusion holes, of which diameter is 0.2 times of the standpipe diameter, are uniformly distributed on the wall of the diffusion standpipe, and the fluid climbing standpipe is fixed on the wall of the relief tank through a pipe clamp, a pin, a fixing plate and a reinforcing plate. When the standpipe is in work, relief fluid flows into the fluid climbing standpipe and climes upwards vertically after passing through a horizontal liquid entering pipe, and part of the pressure head is weakened in the process. The relief fluid, when reaches the top end of the fluid climbing standpipe, falls down vertically along the diffusion standpipe and discharges from the diffusion holes section by section, which effectively disperses the fluidic impact force and weakens the impact of surge liquid over the tank body. Liquid is controlled by changing the flowing direction of relief fluid so as to weaken the flushing force of surge fluid and prevent damage of tank body. The standpipe is simple in connection structure, and is easy to replace and maintain.