Your plug is overloaded, get the next size larger plug. Overheating causes metal to soften, tight connections to loosen, loose connection offers resistance, resistance consumes power dissipated add heat.
More details would have been useful. Assuming you mean a spark plug keeps melting rather than the power plug of your coolbox or something else - the reason a spark plug melts is generally detonation and is often a prelude to serious engine damage.
Detonation can be caused by the engine running hot, an excessive buildup of carbon, fuel octane rating too low or the wrong heat range of spark plug being used - or any combination of these things.
Sediment buildup in parts of the cylinder block can cause potentially damaging cylinder hot spots.
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