The utility model provides a device for control by temperature change for injection mold, the during operation, all temperature measuring device of PLC intelligent control ware control test to erupt simultaneously to die cavity current temperature and give PLC intelligent control the ware, and the PLC intelligent control ware is through detecting received signal, and the then control of high temperature corresponds the suction pump that the other n type cooling of little die cavity that lies in this signal was said, makes this n type cooling say further to the die cavity cooling of lowering the temperature, detect each little die cavity temperature through the PLC intelligent control ware to the operation corresponds the n type cooling work of saying, can guarantee that the temperature homogeneous of every little die cavity is sent, and is setting for the within range, guarantees that the product quality in every little die cavity is unanimous, the accuracy is high, has overcome in the conventional art and to have said because of only being equipped with a cooling that the die cavity temperature of different positions is inconsistent in the mould that results in, results in the product quality nonconformity, the technical problem that can't be protected