NOVELTY - The treatment unit has a reaction slot accommodating organic fertilizer, and a coil pipe positioned in reaction slot. A pre-heating unit connected to a heating unit has a tank accommodating water made to flow in coil pipe. A backwater unit provided with a tank that stores water from the coil pipe, heats the stored water and circulates heated water back to the coil pipe. A cooling tank collects the water from coil pipe and circulates cooling water to coil pipe. The water in pre-heating unit exchanges heat with water in cooling tank.    USE - Multi-slot type organic fertilizer treatment device.    ADVANTAGE - The heat energy is recycled and reused by circulating the hot water from the backwater unit, the consumption of heat when heating the water is reduced.    DETAILED DESCRIPTION - The treatment unit has a separation board set at the bottom of reaction slot, a heating chamber arranged between the reaction slot and the separation board, and an agitator for agitating organic fertilizer. The backwater unit has a connection pipe connected to the pre-heating unit, discharge pipes provided with discharge valves, and backwater feeding pipes connected with coil pipe and provided with backwater feeding valves. The heaters connected to the backwater discharging pipes are provided with conductive structures positioned on inner and outer surfaces of a pipe-shaped structure and connected to a power supply. The separators are positioned at ends of pipe-shaped structure. The cooling unit is equipped with cooling feeding and discharging pipes connected with cooling tank, and valves positioned on cooling feeding and discharging pipes. A water source machine for exchanging heat between water in pre-heating tank and cooling tank, is equipped with a condenser, an evaporator connected to an expanding valve connected to the condenser, a heating pipe positioned on evaporator and a temperature reducing pipe positioned on condenser.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of the multi-slot type organic fertilizer treatment device.