Mold for injection molding

The invention relates to the field of molds, in particular to a mold for injection molding. The mold comprises an upper mold and a lower mold, the upper mold is installed above the lower mold, a sealing mechanism is arranged above the lower mold and comprises blocking plates and sealing gaskets, blocking plates are slidably installed on the periphery of the upper portion of the lower mold, the sealing gaskets are connected to the sides, facing the lower mold, of the blocking plates, transverse plates are horizontally connected to the two ends of the side face of the upper portion of the lower mold, the blocking plates are slidably installed above the transverse plates, and sliding grooves are formed in the interiors of the transverse plates in the sliding direction of the blocking plates. When the mold is not used, dust cannot enter a space between the upper mold and the lower mold easily through the sealing gaskets, cleaning is not needed during subsequent reuse, the step of cleaning the mold is omitted, whe