The invention relates to a seal head module for a large container, the large container provided with the seal head module, a method for manufacturing the seal head module and a method for manufacturing the large container. The method for manufacturing the seal head module comprises the following steps of: providing a seal head with an annular opening, wherein the seal head consists of a plurality of limbs; providing a plurality of barrel plates; and sequentially connecting each barrel plate to an end face of the annular opening of the seal head, connecting opposite side faces of all the adjacent barrel plates to form a barrel ring of the seal head, adjusting the gap between adjacent barrel plates based on dislocation of the limbs at the annular opening of the seal head and/or adjusting the positions of the barrel plates on the end face of the annular opening of the seal head in a radial inwards or radial outwards mode.