This cylinder head gasket assembly is a core sealing component installed between the engine cylinder head and cylinder block. It seals the combustion chamber, cooling water passage and oil passage to prevent leakage of gas, coolant and engine oil. Adopting multi-layer metal composite structure, it maintains stable sealing performance under high temperature, high pressure and frequent thermal cycling during long-haul heavy-load driving. Every gasket undergoes dimensional inspection and air tightness test before delivery. It solves faults such as water leakage, oil seepage and cylinder gas blow-by, serving as an essential replacement spare part for engine overhaul.