Sun umbrella locking device

A sun umbrella locking device, comprising:

• a sliding base,
• a locking clamping base, and
• a fastening assembly, wherein a sliding chamber is formed in the locking clamping base, and two locking pieces are arranged on side surfaces of the locking clamping base, wherein an expansion joint is formed between the two locking pieces, and the expansion joint extends into the sliding chamber of the locking clamping base,
• wherein the two locking pieces are respectively provided with a first locking hole, the sliding base is provided with an accommodating chamber, and the locking clamping base and the two locking pieces are arranged in the accommodating chamber,
• wherein the sliding base is provided with a second locking hole aligned with the first locking hole, wherein after passing through the second locking hole and the first locking hole, the fastening assembly is connected to the sliding base and the locking clamping base,
• wherein a fixing ring is arranged at a top portion of the locking clamping base,
• wherein a transverse groove extending transversely is provided at a position where the locking clamping base and the fixing ring are connected, the transverse groove extends to an outer side of the locking piece, and the transverse groove is in communication with the expansion joint.