This dramatic footage shows a woman's car rolling forwards into an underground car park where it crashed into a Porsche after she forgot to pull the emergency brake when she stepped outside.

CCTV cameras filmed the costly mishap at the parking entrance in Fuzhou, in China's south-eastern Fujian Province, on the morning of November 1.

In the footage, the woman is seen trying to enter an underground garage with her white Honda vehicle. However, as she turned onto the entrance, she drove too close to a nearby fence and her right rear-view mirror became stuck. She then reversed the car slightly in an attempt to free the mirror and stepped outside to check for any damage.

But as she exited the sedan and walked around the back to the right side of the vehicle, she forgot to pull the handbrake.

Moments later, the vehicle began moving on its own and rolled down the slope and straight into the garage.

She tried to stop the car and ran after it, but tumbled down as it went out of control. The vehicle later crashed into a grey Porsche Cayenne inside the car park.

Another clip shows the extensive damage caused to both vehicles that reportedly crashed head-on.