The invention discloses a pouring system of a wind generator planet carrier, which has the advantages that iron liquor is fully purified, the quality of wind generator planet carrier cast can be effectively improved; the pouring system comprises a filtering part; a filter block (6) is arranged between an upper top trench (5) and a lower top trench I (7), the inlet of the filter block (6) is communicated with the outlet of the upper top trench (5), the outlet of the filter block (6) is communicated with the inlet of the lower top trench I (7); a ring-shaped top trench (9) is provided with a plurality of outlets, outlets of the ring-shaped top trench (9) are in one-to-one correspondence with the lower top trench II (10), filter blocks (6) are arranged between every outlet of the ring-shapedtop trench (9) and corresponding lower top trench II (10), the inlet of the filter block (6) is communicated with the outlet of the ring-shaped top trench (9), and the outlet of the filter block (6) is communicated with the inlet of the lower top trench II (10).