An Australian reptile handler has proposed to his girlfriend inside a crocodile enclosure at a reptile park in New South Wales.

Handler Billy Collett made the proposal during a demonstration while 4.5-metre crocodile Elvis watched on from just metres away.

In a video uploaded to the Australian Reptile Park Facebook page, Mr Collett can be seen inviting his partner Siobhan Oxley to enter the enclosure to "have a crack at feeding the crocodile", before dropping to his knee to make the proposal in front of a crowd of spectators.

Before inviting Ms Oxley in, Mr Collett coaxed the large crocodile out of its pond with what appears to be a piece of meat on the end of a stick.

"Three years ago, next week, I actually met the girl of my dreams; the girl I love more than anything," Mr Collett announced to the crowd.

"The last three years have been, yeah, the best of my life."

Mr Collett tells the crocodile to "stay there" and "behave yourself" before he turns to his partner to propose.

"Siobhan, I want to spend the rest of my life with you, will you marry me?" Mr Collett asks before the crowd bursts into applause.

After she accepts, a clearly relieved Mr Collett jokes that proposing was "worse than feeding a crocodile".

The crocodile appeared to be unmoved by the gesture.