The invention provides a warm core floor, comprising a lower board and an upper board pressed on the lower board; a conductive heating plate is clamped between the upper board and the lower board, wherein the conductive heating plate comprises two layers of substrates; a grid shaped heating unit is pressed between the two layers of substrates; and conductors are respectively arranged on both sides of the heating unit. The warm core floor has the advantages that: 1, the grid structure is uniformly heated; 2, each grid is taken as a minimum heating unit and the temperature control performance is good; and 3, even if the warm core floor is damaged, the heating unit (grid) in the damage range is influenced, and the other heating units can heat normally.