The present invention relates to a landfill gas switching system to which a landfill gas methane direct conversion technology is applied, comprising: a landfill gas collecting device installed in a landfill for collecting landfill gas; and an inertial collision type dust removing device for removing moisture and fine dust from the collected landfill gas An ammonia hydrogen sulphide removal device for removing at least one of ammonia and hydrogen sulphide from the first purified landfill gas firstly purified by the inertial collision type dust removal device; A siloxane removal device for removing siloxane from the second purification buried gas, an oxygen removal device for removing oxygen from the third purification buried gas thirdly purified by the siloxane removal device, A nitrogen removal device for removing nitrogen from the fourth purification buried gas, and a nitrogen removal device for removing nitrogen Encrypted and a storage tank for storing the fifth purification of landfill gas.
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