this paper presents a stable all-fiber q-switched er-doped fiber (edf) laser with ws2/fluorine mica (fm) as the saturable absorber (sa). the sa device is obtained by depositing ws2 nanosheet layers onto a 20 mu m thick one-layer fm substrate using a thermal decomposition method. the modulation depth (md) of the sa is 8.22% and the non-saturable loss (nl) is 16.38%. by inserting the sa into the edf laser cavity, stable q-switched operation is achieved with a central wavelength of 1567 nm. the repetition rate can be tuned from 20.98 khz to 33.74 khz and the pulse duration can be adjusted from 8.3 mu s to 6.98 mu s by increasing the pump power. the maximum output power and the maximum pulse energy are measured to be 2.07 mw and 61.4 nj, respectively. the experimental results evidently show that the ws2/fm can be regarded as a high-performance sa for fiber lasers.