A structure of test piece tank,The utility model comprises a main tank body and an outer tank body,The outer tank body is sheathed outside the main tank,A drying agent is placed in the outer tank,The test pieces are stored in the holding space of the main tank,The cover covers the holding space,The test piece can be protected from moisture and dust through the protection of main tank and outer tank,Besides,Since the bottom of the holding space of the main tank body is provided with a plurality of through holes,Therefore, the desiccant in the outer tank can absorb the moisture in the main tank,By this way, the purpose of moistureproof can be achieved.一種檢驗試片罐之結構,其包括有一主罐體與一外罐體,其中外罐體乃套設於主罐體外,並在外罐體內放置有乾燥劑,而主罐體之容置空間內則儲存有檢驗試片,更透過蓋體遮蔽住該容置空間,使檢驗試片可透過主罐體與外罐體之保護以達到防潮與防塵之目的,另外,由於主罐體之容置空間底部設置有複數透孔,因此可讓外罐體內之乾燥劑來吸收主罐體內之濕氣,藉此更進一步可達到防潮之目的。