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This utility model belongs to the field of mold technology, and particularly relates to a mold for manufacturing automotive decorative grilles, comprising: a base, on which a support seat is fixedly installed on the upper surface of the base, and a U-shaped support frame is arranged directly above the support seat, and the support frame is fixed to the base; an upper mold is arranged between the support frame and the lower mold, and hydraulic cylinders are symmetrically arranged on the upper surface of the upper mold; a clamping mechanism is arranged on the support seat and is used to clamp and fix the lower mold; by setting up a rectangular groove, a telescopic hose, a water pipe, a high-pressure nozzle, and a diversion pipe, water is supplied by a water pump in the rectangular groove and the inner cavity, and the water is diverted through the diversion pipe, and then sprayed out through multiple high-pressure nozzles on two water pipes to wash the surfaces of the lower mold and the upper mold, which solves the problem of the lack of mold cleaning means in traditional devices, and the automated cleaning greatly saves labor and improves efficiency.