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1. A 100% recyclable and replaceable eco-friendly polyethylene terephthalate (PET) lipstick mechanism, comprising a forked cartridge core, wherein a circular-tubular housing rotationally matches an outside of the cartridge core, an axially slidable lipstick cylinder matches an inside of the cartridge core, an inner wall surface of the housing is provided with a spiral groove, the cartridge core is provided with a guide groove axially, and an outer surface of the lipstick cylinder is provided with a protruding pillar, the pillar penetrating the guide groove of the cartridge core to slidably match the spiral groove of the inner wall surface of the housing; an outer circumferential surface of a rear end of the cartridge core is provided with a hand-held section, an outer circumference of a portion, close to the hand-held section at the rear end, of the cartridge core is provided with at least one annular groove or an annular convex rib, and an inner circumferential surface of a portion of the housing is adaptively provided with an annular convex rib or an annular groove for rotatably matching the at least one annular groove or the annular convex rib of the cartridge core; and a front end of the at least one annular groove or the annular convex rib of the cartridge core is provided with an elastic cambered flat spring, a root of the flat spring is connected to a wall portion of the cartridge core into a whole, an end of the flat spring warps upwards to a position higher than a surface of the cartridge core, and the flat spring is clamped in the annular groove correspondingly provided in an inner side surface of the housing after assembled, so as to prevent the cartridge core from being separated from the housing.
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