Construction folding ruler

The utility model relates to a construction folding ruler, belonging to the technical filed of construction tools and being applicable to construction engineering. The two ends of a main ruler are respectively connected with a folding rule 1 and a folding rule 2 through a connecting shaft 1 and a connecting shaft 2, the folding rule 1 and the folding rule 2 can perform 0-360 degrees of rotation along the connecting shaft 1 and the connecting shaft 2, the surfaces of the connecting shaft 1 and the connecting shaft 2 are made of transparent materials, dials are arranged inside, the center of each dial is provided with a pointer and a mark pin, the pointers are connected with the folding rules, the mark pins are connected with the main ruler, and the main ruler, the folding rule 1 and the folding rule 2 are provided with scale marks and are provided with storage boxes for storing plummets in the middle parts. The construction folding ruler, being reasonable in design and convenient to use, allows rapid folding or unfolding use through the two connecting shafts to save the storage space; and moreover, the plummet storage boxes enriches the practical use of the ruler to facilitate the construction of construction engineering.