The invention discloses a multi-sample adaptive dual-entrance quartz pyrolysis tube which comprises a pyrolysis tube body (1), wherein an inert gas connector (2) and an oxygen connector (3) are arranged on the pyrolysis tube body, and a reaction chamber (4) is arranged inside the pyrolysis tube body. The multi-sample adaptive dual-entrance quartz pyrolysis tube is characterized in that a solid injection port (5) and a liquid injection port (6) are at least arranged at the outer side of the pyrolysis tube body. The device realizes the combination of liquid injection and solid injection as one,not only satisfies the liquid sample injection and the solid sample injection in the prior art, realizes the fast switching of different types of sample injections, but also can carry out simultaneous injection of solid and liquid samples.