The invention discloses a wellhead packing box with a split rotatable centralizer. The wellhead packing box comprises a pumping unit polish rod, an upper box body, a lower box body and a tubing jointdecentralizing device, wherein the upper box body, the lower box body and the tubing joint decentralizing device sleeve the pumping unit polish rod sequentially. A hollow rotatable disc is arranged between the upper box body and the lower box body, the split centralizer is embedded into a disc cavity in the rotatable disc and comprises a left arc body and a right arc body which are spliced to forma centralizer rod hole, and the pumping unit polish rod penetrates through the centralizer rod hole. The wellhead packing box with the split rotatable centralizer can solve the eccentric wear problemat a low cost and is easy to operate and high in stability.