The number of murders in the first 11 months of this year surpassed the previous record of 22,409 killings during the whole of 2011.
In November alone, 2,212 murders were recorded -- while 2,380 killings were carried out in October, making it the most violent month since the authorities began keeping records two decades ago.
Violence has surged across Mexico over the last decade after former president Felipe Calderon's government declared war against the country's powerful drug cartels in late 2006.
Some 190,000 people have died in drug related violence since then.
This year, the killings spread to states which had previously escaped clashes between cartels -- including Baja California Sur, a northwestern state popular with tourists where the murder rate has more than doubled from last year's total.
According to experts, this year's considerable increase in violence is the result of cartels fragmenting into smaller, more brutal cells.
Former Drug Enforcement Administration agent Mike Vigil told AFP that cartels have started to fight for territory to grow illicit crops -- while a weak police force and rampant corruption further fuel the problem.
Semaforo Delictivo, a civil society project promoting peace in Mexico, in October said the high murder rate reflected a lack of action by the authorities and a "failure" of their anti-crime strategy.
In a bid to address the issue, Mexico's congress last week approved a controversial internal security law that would formalize the military's role in domestic security.
The move drew criticism from rights groups concerned about the militarization of the country -- while UN rights chief Zeid Ra’ad Al-Hussein said earlier this month it "risks weakening incentives for the civilian authorities to fully assume their law enforcement roles."
"More than a decade after the armed forces were deployed in the so-called war on drugs, violence has not abated and many human rights violations and abuses ... continue to be committed by various state and non-state actors," he said in a statement.
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