The invention discloses a method and structure for improving sand pull effect of an entry of a gate dam. A restraint wall 10m to 20m long extends upstream from a middle pier of a scouring gate; the restraint wall helps increase flowing speed of water in front of a water inlet of a power station; the restraint wall, an water inlet floor and a sand sill cooperate to disturb sand, the sand in front of the water inlet of the power station is under high speed and high disturbance, never stays and is scoured away by the water, and the sand pull effect of the entry of the gate dam is improved. The speed of transverse flow in front of the water inlet of the power station is increased, disturbance is enhanced, and sand pulling and sand scouring are evidently effective; the water inlet of the power station is free of dust; the cross section of the restraint is never great, elevation of the wall top is slightly lower than dam-front lowest generating level, and engineering investment is low.