Mass spectrometer with linear ion storage and time-of-flight mass analyzer connected in series

The invention belongs to the technical field of mass spectrometric analysis, in particular to a mass spectrometer with a linear ion storage and a time-of-flight mass analyzer which are connected in series. The mass spectrometer comprises an ion source, an ion optical system, the linear ion storage, the time-of-flight mass analyzer, an ion detector and a signal detecting, controlling and recording system, wherein the linear ion storage and the time-of-flight mass analyzer are directly connected; an accelerated electric field inlet of the time-of-flight mass analyzer is directly opposite to a lead electrode of the linear ion storage; and a conducting grid net is loaded on the ion lead electrode. After being collected and stored for certain time in the linear ion storage, ions are dispelled through a grid net electrode under the action of pulse voltage applied to the grid net electrode of the linear ion storage, and are led to an ion free flying area of the time-of-flight mass analyzer by the subsequent ion accelerating voltage, and then time-of-flight mass spectrometric analysis is finished. The combined instrument is good in performance and convenient to use, and the limitations and defects of the current combined instrument are overcome.