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Abstract We study the ratio of fragmentation fractions, $$f_{\Xi _b}/f_{\Lambda _b}$$ fΞb/fΛb , from the measurement of $$\Xi _b^0\rightarrow \Xi _c^+\pi ^-$$ Ξb0→Ξc+π- and $$\Lambda _b^0\rightarrow \Lambda _c^+\pi ^-$$ Λb0→Λc+π- with $$\Xi _{c}^{+}/\Lambda _{c}^{+}\rightarrow p K^-\pi ^+$$ Ξc+/Λc+→pK-π+ . With the branching fraction $$\mathcal {B}(\Xi _c^+\rightarrow pK^-\pi ^+)=(2.2\pm 0.8)\%$$ B(Ξc+→pK-π+)=(2.2±0.8)% obtained under the U-spin symmetry, the fragmentation ratio is determined as $$f_{\Xi _b}/f_{\Lambda _b}$$ fΞb/fΛb $$\,\, =0.054\pm 0.020$$ =0.054±0.020 . To reduce the above uncertainties, we suggest to measure the branching fractions of $$\Xi _c^+\rightarrow p \overline{K}^{*0}$$ Ξc+→pK¯∗0 and $$\Lambda _c^+\rightarrow \Sigma ^+ K^{*0}$$ Λc+→Σ+K∗0 at BESIII, Belle II and LHCb.