The invention discloses a formula fertilizer distributor which comprises a passive fertilizer injection system, wherein a water inlet end of the passive fertilizer injection system is arranged in back of a main pump station of a water fertilizer irrigation system, and a fertilizer outlet end of the passive fertilizer injection system is arranged at the downstream of a water flow direction of a main pipeline of the irrigation system; and the fertilizer injection system comprises venturi fertilizer injectors and a formula fertilizer selector. According to the formula fertilizer distributor, after the formula fertilizer selector is used, a normal close three-way hydraulic valve principle is used, normal close three-way hydraulic valves are connected with fertilizer tanks to form the fertilizer distributor, the normal close three-way hydraulic valves are taken as control switches at the same time to control the select of the type and the quantity of fertilizer components to carry out the exact formula fertilization, so that various fertilizer combination modes can be realized; and the formula fertilizer selector and the venturi fertilizer injectors are combined, a fertilizer is injected into a main pipeline without power applied by an additional system, the characteristic of the main pipeline that the upstream water pressure is large and the downstream water pressure is low is used, and fertilizer liquid automatically flows to the downstream after being mixed with irrigation water, so that the use cost and the maintenance cost can be reduced, the energy consumption can be saved, and the formula fertilizer distributor can provide the support for the good popularization of an accurate fertilization technology.