A clutchable winch contains a shaft member including: a tube used to fix a belt; a fitting piece including a central hole mounted thereon; a column fixed on the central hole; a sleeve coupled with the fitting piece, including a groove arranged on one end thereof and a connecting end secured on another end thereof, the connecting end including plural apertures disposed thereon; a positioning disc fixed on a bottom end of the groove, including plural first inclined teeth arranged therearound, the first inclined teeth being spaced apart evenly from each other and each having a vertical side; an annular actuating plate fitted on the column, including a hexagonal pore arranged on a central portion thereof and plural second inclined teeth disposed on one end surface thereof, wherein each second tooth includes a vertical fringe; a compression spring defined between the actuating plate and the fitting piece of the tube.