ACCC deputy chairwoman Delia Rickard said investigators will today go undercover to comb through 100 websites to see if they are operating above board.
"We're looking to see whether they're clear and transparent for consumers in terms of costs, in terms of cancellation rights, and whether they're providing a safe environment in terms of protecting people from scams," Ms Rickard said.
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Singles in Sydney, Melbourne, Brisbane and Perth are now finding love online thanks to dating sites like Urbansocial.
It is also worried about an emerging trend which shows websites use hidden costs and unfair contracts to swindle consumers.
In 2013, Australians lost million to dating and romance scams, the ACCC said.
It shows an increase across all ancestry groups, with a large jump in some groups such as those of Greek, Lebanese or Chinese ancestry.
In these groups, first generation inter-partnering rates sit at around 10 per cent, and increase to 30 per cent or more in the second generation and 60 per cent or more by the third generation.