Vise capable of linear and rotational movement

A multiple-function clamping device comprising:

• a rotary base having an annular groove defined in a top thereof, scale marks being marked along an inclined surface of the rotary base, two oval notches defined in two opposite sides of the rotary base;
• a positioning unit having a first positioning member and a second positioning member, the positioning unit located in the annular groove of the rotary base so as to form a linear slot between the first and second positioning members, the positioning unit movable in the annular groove, the first positioning member having a first alignment line which is located corresponding to the scale marks, multiple linear marks marked on a top of the first positioning member, and
• a vise having two side slots defined in two sides thereof so as to form an engaging portion between the two side slots, the first and second positioning members respectively located within the two side slots, the engaging portion engaged with the linear slot between the first and second positioning members so that the vise is positioned or movable linearly relative to the rotary base, the vise having a second alignment line which is located corresponding to the linear scale marks of the first positioning member.