  Measurements of single Higgs production and its decays are in good agreement
with the Standard Model. There is still room for large modifications in double
Higgs production at LHC, though these effects may be correlated with large
corrections to other observables, in particular single Higgs production. In
this work we address the issue of enhancing double Higgs production in the
presence of scalar leptoquarks while satisfying all experimental constraints.
We show at leading order that including more than one species of leptoquarks,
large cubic interactions with the Higgs can lead to sizable enhancement of
di-Higgs production cross section at LHC, while at the same time keeping other
Higgs observables and precision measurements under control. For masses above
800 GeV these corrections are in general below 30%, whereas in a viable
scenario in which one of the leptoquarks can be light, specifically in the mass
range $400-600$ GeV, we show that it is possible to roughly double the SM cross
section for di-Higgs production, implying that possible first hints of it may
be probed at the high luminosity LHC at $\mathcal{L}\sim 2$ ab$^{-1}$.
