Bin explosion protection device

The invention discloses a bin explosion protection device which comprises an accommodating part. The top of the accommodating part is communicated with a control bin arranged in a sampler through a communicating pipe; a linkage cut-off valve is arranged on the communicating pipe above the accommodating part; a touch part is arranged in the accommodating part and triggers a linkage stop valve to beopened and closed; the linkage stop valve is connected with an alarm switch arranged on the accommodating part; a touch part comprises a floating ball and a trigger rod fixedly arranged at the top ofthe floating ball, and the upper end of the trigger rod extends into the communicating pipe to be connected with the linkage stop valve. According to the invention, the floating ball arranged in theaccommodating part falls down due to gravity in a normal working state; the trigger rod triggers the linkage stop valve to be opened, and an air bag is communicated with the control bin; when the airbag is damaged and water ent