The giant figure comes as Beijing has made getting credit cheap and easy in an effort to boost slowing growth in the world's second-largest economy.
But analysts have warned that a debt-fuelled rebound might be short-lived and ballooning borrowings risk sparking a financial crisis as bad loans and bond defaults increased.
Wang Shengbang, a high-ranking official with the China Banking Regulatory Commission (CBRC), said the country's banks had seen their non-performing loan ratios rise consistently for four and a half years, reaching 1.75 per cent at the end of March.
"Current figures show the banking sector's operation is generally stable and the risks are under control," he told reporters at a briefing.
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"The CBRC took precaution measures in advance and in 2011... Required banks to set aside more in provisions while the economy was in an upturn cycle so that we were able to accomodate huge writedowns when the economy was in a downturn cycle," he said.
China's total debt hit 168.48 trillion yuan at the end of last year, equivalent to 249 per cent of the national GDP, top government think tank the China Academy of Social Sciences (CASS) has estimated.
But none of the officials at today's briefing -- from the central bank, finance ministry, and national planning agency -- addressed questions about SOE debt levels, with the moderator referring the issue to the "relevant authorities".
China's government debt ratio was 41.5 per cent of GDP at the end of 2015 if contingent debt -- obligations that authorities are not liable for at present, but could become responsible for -- was included, said Wang Kebing of the finance ministry.