The utility model provides a filter device of a leather dyeing drum, and belongs to the technical field of leather dyeing equipment. The filter device of the leather dyeing drum solves the technical problem that in the prior art, flocks in refluent dye liquor can easily accumulate in an inner chamber of a drum body, so that quality and purity of the dye liquor are low. The filter device of the leather dyeing drum comprises a barrel body, wherein a central through hole is formed in the barrel body, a filter screen used for covering the central through hole is detachably fixed to the inner side wall of the barrel body, an upper clamping hook used for being connected with a liquor storage tank in a clamping mode is arranged at the upper end of the barrel body, and a lower clamping hook used for being connected with a water inlet pipe in a clamping mode is arranged at the lower end of the barrel body. According to the filter device of the leather dyeing drum, due to the fact that the refluent dye liquor is filtered, the quality and the purity of the refluent dye liquor are improved, and the dyeing efficiency of the leather dyeing drum is improved.