The invention discloses a marine detection device convenient for sampling. A fixed collecting plate is welded to the inner side of a mounting 
pipe, an ascending 
pipe penetrates through the top end of the fixed collecting plate, an extraction block is placed on the inner side of the ascending 
pipe, an extraction electric push rod is connected to the top end of the extraction block, a connecting 
rope is slidably clamped to one end of the inner side of a storage cylinder, and a 
buoy is connected to one end of the connecting 
rope. The other end of the connecting 
rope is connected with a U-shaped clamping plate, and a sealing limiting block is clamped to the inner side of the sliding opening. Sea water is discharged into the storage cylinder through the water outlet pipe, the needle cylinder principle is utilized, the sea water stably enters the storage cylinder, meanwhile, the injection height of the sea water is limited, the situation that the sea water overflows due to the fact that the sea water is injected from the top end is avoided, the service life of the sea 
water storage device is prolonged, and the service life of the sea 
water storage device is prolonged. The water inlet is limited through the limiting spring and the sealing limiting block, 
seawater is prevented from spilling out when the storage 
barrel moves, and therefore the sealing effect of the storage 
barrel is guaranteed, internal parts are protected, and the parts are prevented from being soaked in the 
seawater.