Leaf hydraulic conductance and the vulnerability to water deficits have profound effects on plant distribution and mortality. In this study, we compiled a leaf hydraulic trait dataset with 311 species-at-site combinations from biomes worldwide. These traits included maximum leaf hydraulic conductance ( K _leaf ), water potential at 50% loss of K _leaf (P50 _leaf ), and minimum leaf water potential ( Ψ _min ). Leaf hydraulic safety margin (HSM _leaf ) was calculated as the difference between Ψ _min and P50 _leaf . Our results indicated that 70% of the studied species had a narrow HSM _leaf (less than 1 MPa), which was consistent with the global pattern of stem hydraulic safety margin. There was a positive relationship between HSM _leaf and aridity index (the ratio of mean annual precipitation to potential evapotranspiration), as species from humid sites tended to have larger HSM _leaf . We found a significant relationship between K _leaf and P50 _leaf across global angiosperm woody species and within each of the different plant groups. This global analysis of leaf hydraulic traits improves our understanding of plant hydraulic response to environmental change.