The intra-cavity frequency-doubled vertical external-cavity surface-emitting laser (VECSEL) has high intra-cavity circulation power and can obtain ideal frequency-doubling conversion efficiency. The progress in VECSEL is reviewed. The usage of different nonlinear crystals and the achieved harmonic wavebands obtained by different frequency-doubled VECSELs are summarized, and the tendency of VECSEL and the problems confronted in future work are discussed.