Reagent bottle and bottle lid thereof

The bottle lid of reagent bottle is including first apron (10), second cover (20), elastic component (30) and bottle connecting piece (40). First apron has cavity (11), first contact surface (13), first through -hole (15) and stopper chamber (17). Second cover has lug (21), second contact surface (23), second through -hole (25) and stopple (27). The lug is coaxial and transition fit with the cavity, and first apron and second cover can rotate relatively, and has one the 1st relative position and one the 2nd relative position. Lug (21) have the post chambers of the heart (22), and the elastic component sets up in the post chambers of the heart and connects first apron and second cover. The second contact surface can with first contact surface to surface contact. When being in a relative position, second through -hole and first through -hole intercommunication, the stopple lies in the stopper intracavity. When being in the 2nd relative position, the stopple seals first through -hole. This bottle lid can prevent