The invention discloses a boiling chlorination furnace for preparing titanium tetrachloride by using fine-graded artificial rutile, which comprises a boiling chlorination reactor, a chlorine pre-distributor, a chlorine distributor and a boiling chlorination furnace roof, wherein a chlorine inlet capable of introducing gas in a tangential direction is arranged on the chlorine pre-distributor. The chlorine distributor is an inverted truncated cone cylinder, the upper end of the truncated cone cylinder is opened, the included angle of a truncated cone bus and the axis is 30-45 DEG; several small holes are uniformly arranged on the wall of the chlorine distributor, each small hole is tangent to the outer wall of the chlorine distributor, and the tangential direction of the small hole is similar with the tangential direction of the chlorine inlet. A filling tube which enters from the center of the furnace roof is arranged at the boiling chlorination furnace roof, the upper part of the filling tube is connected to a material sending pot, the lower end of the filling tube is a horn-shaped diffusion outlet, and the lower edge of the outlet has same height as a material returning inlet. According to the invention, overflow of the fine-graded artificial rutile can be avoided, the fine-graded artificial rutile is dispersed and suspended in chlorine flow, so that the chlorination reaction efficiency can be greatly increased.