A swimming goggles buckle is latched to a head strap and swimming goggles. The head strap includes protruding strips. The swimming goggles buckle includes a fastener and a retaining component. The fastener includes connecting legs, a pivot portion and an elastic plate. The connecting legs latch the swimming goggles. The pivot portion is at the middle of the fastener. The elastic plate is installed on a side of the fastener. The retaining component includes a shaft, a latching portion and a press portion. The shaft is pivotally installed in the pivot portion. The latching portion is on a side of the shaft and corresponding to the protruding strips. The press portion is on another side of the shaft and corresponding to the elastic plate. The press portion is pressed to separate the latching portion or latch the protruding strips to adjust the length of the head strap by one hand.
