The invention relates to a tray box for a radiator assembly, and belongs to the field of auto parts. The tray box for the radiator assembly comprises a tray box body, a fixing assembly and fastening assemblies, wherein the fixing assembly is arranged in the tray box body; the fastening assemblies are arranged at two sides of the tray box body; each fastening assembly comprises a first fastening rod and a second fastening rod; each first fastening rod is arranged between a tray box bottom plate and a tray box top plate; each second fastening rod is arranged vertically to the first fastening rod; one end of each first fastening rod is connected with the tray box bottom plate and the other end is connected with the tray box top plate; and an included angle between each first fastening rod and the bottom plane of the tray box bottom plate is 50 degrees. One tray box provided by the invention can accommodate five radiator module products; and the five radiator module products are packed with a wrapping tape for all-directional protection after being accommodated, so that the product is relatively effectively protected; the occupied space is reduced by 1/2; the transportation cost is effectively reduced; the boxing efficiency is high; the packing cost is reduced in doubles; and the labor intensity is low.