The present disclosure discloses a quantum dot light emitting device and application thereof. The quantum dot light emitting device includes: an anode and a cathode disposed oppositely, a quantum dot light emitting layer arranged between the anode and the cathode, and a hole transport layer arranged between the anode and the quantum dot light emitting layer, wherein a material of the hole transport layer is a copper-based quantum dot with a short-chain ligand on a surface.