The invention discloses a magnesium chloride discharging device for manufacturing titanium sponge using a reversed-U-shaped furnace. The magnesium chloride discharging device is mainly composed of a reactor, a magnesium chloride flow guiding tube, a condenser and a magnesium chloride collecting hopper, a spill prevention tube body is arranged in the condenser, the magnesium chloride collecting hopper is arranged in the spill prevention tube body, a gas collecting hood is arranged on the upper part of the spill prevention tube body, the gas collecting hood is sequentially connected with a buffer tank, a draught fan and an adsorption treatment tank through pipelines. When magnesium chloride is discharged in the reduction reaction, smoke gas is collected and treated by using the magnesium chloride discharging device for manufacturing titanium sponge using the reversed-U-shaped furnace, unordered discharging is avoided, the phenomenon of magnesium chloride spilling is avoided, and safety accidents are eliminated.