Abstract: The lightning protection device is a critical infrastructure for ensuring the safe operation of transmission lines, power distribution equipment, and substations. The reliability of its conductor connection points directly determines the device's current diversion effectiveness and protective capacity under lightning strikes. This paper analyzes the failure mechanisms of lightning protection device connections, investigates the design scheme of the interlocking clamping mechanism for press-fit blocks in power lightning protection systems, proposes structural designs for press-fit blocks, interlocking clamping implementation methods, clamping force distribution control, and temperature-compensated structural designs. Experimental validation of the interlocking clamping mechanism for press-fit blocks is conducted to enhance conductor connection stability and improve the operational reliability of lightning protection devices.