According to Official Guinness Records,
This record is for the largest colouring book in terms of surface area of the closed book.This record is to be attempted by an individual or a team of unlimited size. This record is measured in square metres (m) to the nearest 0.01 m, with the equivalent imperial measurement given in square feet and inches (ft² in²).For the purposes of the record, a 'colouring book' is defined as a type of book containing line art for a reader to add colour using crayons, coloured pencils, marker pens, paint or other artistic media.
For a complete list of 2018 records, please visit 2018 Guinness Records in China.