The woman rode through security screening machine on Sunday in the southern city of Dongguan because she wanted to protect her money, Chinese media reported.
Security staff were shocked to see the silhouette of a woman as they monitored the X-ray screens.
Video from the digital news platform Pear Video showed a guard apparently telling the woman that small bags need to go in the machine as well.
Footage shows the woman emerging from the machine and climbing off the belt after kneeling down behind her belongings as they went through the check.
She then checked her handbag and a suitcase before leaving the checkpoint.
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Still X-ray images online show a person in high heels kneeling among bags and other items.
Railway staff have warned members of the public not to climb into X-ray machines as the radiation is harmful to people, Pear Video reported.
Many Chinese migrant workers carry their annual earnings home to family in cash during the Lunar New Year holiday, the busiest travel period of the year, which falls on February 16.
The state-run People’s Daily newspaper said: “Passengers are warned that not only is this kind of behaviour forbidden, but the radiation from the machine is incredibly harmful to human health.”
Around the nation, some 390 million people are expected to travel by train in a 4-day period.
A total of 2.98 billion trips would be made by the 1.4 billion Chinese citizens by train, bus and air during the holiday season, according to China Central Television Station.