A luxury boat crashed into another at the Auckland on Water boat show on Sunday, causing damage to the boat and dock.

The Auckland on Water boat show in the Viaduct Harbour ended with a smash after two luxury boats collided.

The crash occurred just after the show came to a close, as a Riviera luxury boat slammed into the side of an Azimut luxury cruiser.

In a Youtube video captured by a witness, the 15.8 metre Riviera can be seen moving away from the 23 metre Azimut, named 'Quest II', immediately following the crash.

The witness said he believed the driver of the Riviera had put his full throttle on prior to the crash.

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The Auckland on water boat show takes place annually to showcase New Zealand's marine market and is billed as the country's largest on-water boat show.

Abigail Dougherty The damage sustained was on the side of the cruiser.

Both boats involved were believed to be worth at least $2 million.

A Maritime New Zealand spokeswoman confirmed the incident had been logged, and an investigation was underway.