Context : The chemical evolution of lithium in the Milky Way represents a major problem in modern astrophysics .
Indeed , lithium is , on the one hand , easily destroyed in stellar interiors , and , on the other hand , produced at some specific stellar evolutionary stages that are still not well constrained .

Aims : The goal of this paper is to investigate the lithium stellar content of Milky Way stars in order to put constraints on the lithium chemical enrichment in our Galaxy , in particular in both the thin and thick discs .

Methods : Thanks to high-resolution spectra from the ESO archive and high quality atmospheric parameters , we were able to build a massive and homogeneous catalogue of lithium abundances for 7 300 stars derived with an automatic method coupling , a synthetic spectra grid , and a Gauss-Newton algorithm .
We validated these lithium abundances with literature values , including those of the Gaia benchmark stars .

Results : In terms of lithium galactic evolution , we show that the interstellar lithium abundance increases with metallicity by 1 dex from [ \text { M } / \text { H } ] = -1 dex to +0.0 dex .
Moreover , we find that this lithium ISM abundance decreases by about 0.5 dex at super-solar metalllicity .
Based on a chemical separation , we also observed that the stellar lithium content in the thick disc increases rather slightly with metallicity , while the thin disc shows a steeper increase .
The lithium abundance distribution of \alpha -rich , metal-rich stars has a peak at \text { A } _ { \text { Li } } \sim 3 dex .

Conclusions : We conclude that the thick disc stars suffered of a low lithium chemical enrichment , showing lithium abundances rather close to the Spite plateau while the thin disc stars clearly show an increasing lithium chemical enrichment with the metallicity , probably thanks to the contribution of low-mass stars .