2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/203977We study the constraints on the dark energy model with constant equation of state parameter $w=p/ρ$ and the holographic dark energy model by using the weak gravity conjecture. The combination of weak gravity conjecture and the observational data gives $w<-0.7$ at the $3σ$ confidence level. The holographic dark energy model realized by a scalar field is in swampland.4 two column pages, 3 figures, accepted by Chin. Phys. LettGeneral Relativity and Quantum Cosmologytext