The invention provides a quantum dot display panel and a display device, relates to the technical field of display, and can solve a problem of low luminous efficiency of a quantum dot display device.The quantum dot display panel is provided with a plurality of sub-pixels. The quantum dot display panel comprises a quantum dot array, a first lens array and a dimming layer. The quantum dot array comprises a plurality of quantum dot luminous layers arranged at intervals, wherein one quantum dot luminous layer is arranged in one sub-pixel. The first lens array is arranged on the light emitting side of the quantum dot array and comprises a plurality of first lenses arranged at intervals. One lens is arranged in one sub-pixel, and the first lens is used for emitting parallel light. The dimming layer is arranged on the light emitting side of the first lens array and is provided with a plurality of dimming regions with adjustable transmittance. One dimming region is arranged in one sub-pixel.The display device comprises the quantum dot display panel provided by the invention.