The outbreak began in November near the landlocked southern African nations northern border with Tanzania and has since spread to other regions of the country.
UNICEF's representative to Malawi Johannes Wedenig told local media that "as long as people in Malawi dont change the behaviour of using unsafe water, itll be very difficult to contain".
He urged Malawians to follow strict sanitation rules and stressed the importance of hand-washing before eating or preparing food.
Clean water and hygiene standards are critical to controlling transmission.
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The country has also received 216,000 oral cholera treatment packs from the World Health Organization which are being distributed in the badly-affected northern region, health ministry spokesman Joshua Malango told AFP.
Another 450,000 doses are expected to arrive soon for distribution in the rest of the country, added Malango, confirming the current toll.
Health officials have begun a media blitz to educate people about the risk of cholera and what steps they can take to avoid contracting it.