Abstract: The effects of non-Newtonian gravity on the properties of color-flavor-locked strange quark stars are studied using the standard MIT bag model. It is shown that the maximum mass of color-flavor-locked strange quark stars increases not only with the increasing of the value of color-superconducting energy gap, but also with the increasing of the non-Newtonian gravity parameter. Moreover, color-superconducting energy gap and non-Newtonian gravity parameter are constrained by the mass of the second component of the GW190814 event (M=2.6 M_ \odot). It turns out that M_\max＞2.6 M_ \odot (M_\max is the maximum mass of the stars) can be satisfied only if \Delta＞94.5 MeV (\Delta is the color-superconducting energy gap) without the consideration of non-Newtonian gravity effects. However, if non-Newtonian gravity effects are included, smaller values of \Delta could satisfy M_\max＞2.6 M_ \odot. Since small color-superconducting energy gap is favored by the surface temperature observation of the central compact object in Hess J1731−347 supernova remnant, the inclusion of non-Newtonian gravity effects is helpful in the explanation of the observed large mass of the second component of the GW190814 event.