Abstract: A retaining clamp for cooling fins comprises a L-shaped retaining lever, a resilient component, and a detachable lever. The L-shaped retaining lever is an elongated lever provides a fixing component at the bottom thereof. An end of the L-shaped retaining lever extends a vertical bent part with a locking hook, and the other end thereof is a narrow hanging part. The resilient component is disposed beneath the L-shaped retaining lever and fixed by the fixing component. The detachable lever has an end thereof extend a handle, and has the other end thereof provide a hook. A hanging groove is on the detachable lever between two ends thereof for being passed through by the hanging part on the L-shaped retaining lever. No flexibility is necessary for the L-shaped retaining lever so that no heat treatment is required and it does not result in deformation. The resilient component can have a changeable height to accommodate cooling fins indifferent sizes.