The incident took place in the forest near Ramaram village under Chintagufa police station limits, Sukma Superintendent of Police D Shrawan told PTI.
A joint team of CRPF and district police was in Chintagufa region, around 500 km from the state capital Raipur, when ultras opened fire. The body of a male Naxal was recovered later.
Assistant commandant Alok Kumar and constables Jatan Lal and Ravindra Kumar of the 150th battalion of CRPF sustained minor injuries and were admitted to a local hospital, the SP said.
A reinforcement was sent and combing was underway in the region, he added. Security forces are already on alert as Maoists are observing 'Martyrs' Week' to commemorate their fallen comrades.