Multi-stage heat dissipation type desktop computer

The invention provides a multi-stage heat dissipation type desktop computer which comprises a basic assembly, wherein the basic assembly comprises a desktop computer shell; a dustproof assembly which comprises a shell arranged at the top of the desktop computer shell, wherein a winding roller is rotationally arranged in the shell, dust shielding cloth is wound on the outer wall of the winding roller, and a limiting block attached to the top of the cushion block is arranged at the bottom of the dust shielding cloth; and a heat dissipation assembly convenient to maintain which is arranged on the rear side of the desktop computer shell. According to the technical scheme, the dustproof assembly is arranged on the shell of the desktop computer, when the desktop computer is not used, the clamping pin is pulled out, the disc body is rotated to enable the winding roller to rotate to release the dust shielding cloth, the dust shielding cloth is located on the front side of the shell of the desktop computer, and extern