It is illegal for mainland law enforcers to operate in semi-autonomous Hong Kong under the city's mini-constitution, the Basic Law.
But there are already concerns that Chinese operatives are working undercover after the alleged abductions of a city bookseller and a reclusive Chinese businessman.
The rail link plan comes at a time when fears are worsening that Hong Kong's freedoms are under threat from an ever more assertive Beijing.
A proposal backed by the Hong Kong government's top advisory body Tuesday would see mainland border staff control a special immigration zone at the Hong Kong terminus.
There are already numerous transport connections between Hong Kong and the mainland, but Chinese immigration checks are done on the other side of the border.
City leader Carrie Lam insisted the new checkpoint arrangement was not a breach of the Basic Law and was designed to cut travel time.
Pro-Beijing lawmaker Priscilla Leung said such joint immigration areas were common around the world and that Hong Kong would be "leasing" the portion of land at the terminus to China.
"Outside the zone both the officers and everyone else have to obey the laws in Hong Kong," she told AFP.
But opponents say the new plan is a clear breach of the Basic Law and another sign that Hong Kong is being swallowed up by China.
It would put at risk the semi-autonomous "one country, two systems" set-up guaranteed when Britain handed Hong Kong back to China in 1997, Lee told AFP.
The government wanted to force through the plan to make Hong Kong people "feel closer to Beijing, the sovereign power", added opposition legislator Claudia Mo.
The plan now needs approval from the city's legislature, which is weighted towards the pro-China camp.
Passengers from Hong Kong could reach Beijing in under 10 hours on the new line, but controversies have plagued the project, with snowballing costs now at 84.42 billion Hong Kong dollars (USD 10 billion).
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