The invention relates to an insulating pull rod pouring mould and a sealing cover thereof. The insulating pull rod pouring mould comprises an outer mould and a core shaft arranged in the outer mould.A mould cavity used for forming of an insulating pull rod is defined by the outer mould and the core shaft. The end of the outer mould is provided with the sealing cover used for being fixedly assembled with the outer mould. The side, facing the mould cavity, of the sealing cover is provided with a positioning hole used for positioning the end of the core shaft. The hole wall of the positioning hole is provided with a material storage groove used for conducting material supplementing on the mould cavity in the curing process. By forming the material storage groove in the sealing cover, materials put in the material storage groove can be supplemented to a shrinkage part in the curing process, the problem that the size of the insulating pull rod does not meet the requirement due to materialshrinkage in the curing process of the insulating pull rod material is solved, the curing using amount is ensured, and the problem of secondary material adding is avoided; and meanwhile, a space is provided for gas escaping from the materials through the material storage groove after material supplementing is conducted, and the situation that the gas is accumulated in the materials to form defectsis avoided.