Color wheel module and projection device

A color wheel module comprises a driving assembly, a substrate, a clamping element, at least one wavelength conversion layer and a plurality of optical filters. The optical filter is arranged around the rotation axis in a manner of being perpendicular to the rotation axis of the driving assembly. The clamping element is attached to the optical filter along the rotation axis. The substrate is connected with the optical filter, and the optical filter is fixed between the clamping element and the driving assembly. The driving assembly drives the substrate and the optical filter to rotate with the rotation axis as the central axis. The substrate comprises an outer wall, and the substrate is provided with a light conversion area located on the outer wall and used for configuring the wavelength conversion layer. The extension direction of the outer wall forms an included angle with the radial direction of the substrate and has a width parallel to the extension direction. The excitation light beam enters the light c