The present invention relates to an assembly-type protractor, and the problem to be solved is that it is very easy to find a reference line of 0°, and an acute angle and an obtuse angle can be easily distinguished with only a protractor, and an angle of 180° or more is recognized through the assembly of a 90° basic protractor. It can be said that it is optimized to measure and measure. This 360° assembly-type protractor is to provide an assembly-type protractor with creativity, ease of learning, and practicality differentiated from conventional protractors. For example, it includes a plurality of protractor units that are separated by a predetermined angle unit based on 360 degrees and are mutually assembled by having at least one of a physical detachment unit and a magnetic detachment unit, and the protractor unit is divided into 90 degree units. Disclosed is an assembly-type protractor that is divided into a divided sector-shaped first protractor unit, a second protractor unit, a third protractor unit, and a fourth protractor unit, and is formed in a circle shape capable of measuring 360 degrees when assembled.
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