The utility model discloses a portable form board tool. The portable form board tool comprises a cross-shaped positioner formed by two mutually perpendicular positioning plates; the cross-shaped positioner is provided with a long positioning plate and a short positioning plate; the long positioning plate of the cross-shaped positioner is connected with an angle positioner; the cross-shaped positioner is provided with a center positioning hole; the center positioning hole is positioned at the intersection point of the two mutually perpendicular positioning plates; a center identification hole of the angle positioner is positioned at the intersection point of the 0 DEG graduation line and the 90 DEG graduation line of the angle positioner; the cross-shaped positioner is engraved with measurement graduation lines; and the arc edge of the angle positioner is engraved with angle graduation lines. Functions of setting-out measurement and positioning identification are integrated, a traditional measuring ruler and a traditional protractor are combined, angles can be measured when lines are measured, practicality of the tool is greatly improved, and the tool is compact and simple in structure and is portable.