Portable cutting device includes: the annular saw main part that has rotating circular disk cutting blade, and the fixed partly fixed cover that arrives the annular saw main part with cover disk blade's radial outer peripheral edges. The annular saw main part is supported by the base for can adjust the angle of annular saw main part on upper and lower direction and left right direction at the upside of base. Another radial outer peripheral edges of disc cutting blade are covered by auxiliary cover. Auxiliary cover covers the clearance between fixed cover and the base in near the department vertical pivot supporting axle of annular saw main part. Auxiliary cover passes through auxiliary cover vertical moving mechanism to the base in ascending angle square from top to bottom according to theannular saw bulk phase and moves for the annular saw main part. Auxiliary cover passes through lateral inclination supporting axle pivotally connected to to base on left right direction. The angle ofauxiliary cover on according to the left right direction of annular saw main part is through interlocking mechanism around lateral inclination supporting axle pivot on left right direction.
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