The actor had been fitted with the lengthy metal blades on his hands when he tried to hide himself from female workers on set, leaving himself with a wound to the top of his thigh.
Jackman - who has played X Men character Wolverine several times - told of his accident as he appeared as a guest on tomorrow night's edition of BBC1's The Graham Norton Show.
The 45-year-old star said: "There was a very intense first scene and I insisted on a closed set. I ran round the corner and all the female members of the crew were gathered there.
"I tried to cover myself and cut my inner thigh - it was just the inner thigh thankfully. The metal claws had to go - you can't have bits and pieces flying off."
Jackman - soon to be seen in X Men: Days Of Futures Past - told how he has to spend six months training to get into shape for his role as the mutant superhero.
Due to the frequency of his appearances, he had spent a total of 18 months keeping his body in check for his most recent stint as Wolverine.
His co-star Michael Fassbender - also a guest on the chat show - praised his colleague's commitment to the gym.
"His discipline is incredible - he is up and in the gym at 4.30 in the morning, every morning," Fassbender said. "When we arrived there was a 'Jackman' effect and we all started training to try and keep up."