The invention relates to a cargo compartment sectioning design method for a 80,000-cubic-level film type LNG (
liquefied natural gas) ship, a cargo compartment is divided into four compartments including a bottom and
bilge section, a side section, a bulkhead and a
deck section. The method comprises a cargo compartment bottom and
bilge section dividing form, a cargo compartment side section dividing form, a cargo compartment bottom and
bilge section dividing form, a cargo compartment bottom and bilge section dividing form, a cargo compartment side section dividing form, a cargo compartment bottom and bilge section dividing form and a cargo compartment bottom and bilge section dividing form. A cargo compartment division form and a cargo compartment
deck subsection division form are adopted, each of the four cabins is longitudinally divided into three ring sections. Meanwhile, it is guaranteed that the full-width block of the
deck is complete, a low-temperature
pipe system on the deck is installed in the total
assembly stage in advance, and meanwhile ship body key nodes W4 on the inner wall of the cargo compartment are divided into subsection internal nodes; the invention further relates to a cargo compartment section designed and built based on the method. According to the method disclosed by the invention, the cargo compartment is divided and designed in sections, so that high efficiency and high quality of ship construction are ensured, the construction is completed on schedule, Meanwhile, the construction period is shortened and the
coating PSPC standard is met.