Provided is a 3D (Three-dimensional) mesh fabric pet bed with enhanced air permeability, belonging to the technical field of pet beds. The pet bed includes a first 3D mesh fabric mattress assembly, a second 3D mesh fabric mattress assembly, and a bracket assembly. A first 3D mesh fabric mattress assembly and a second 3D mesh fabric mattress assembly are provided. The first 3D mesh fabric mattress assembly and the second 3D mesh fabric mattress assembly are disposed in an up-down overlapping structure, and the dual-layer 3D mesh fabric mattress assembly can enhance overall support strength while maintaining excellent air permeability.