Surface water petroleum substance detecting and sampling device

The utility model relates to a device for detecting and sampling petroleum substances in surface water. The movable fixing device comprises a bearing tray, a mounting groove formed in the bearing tray, a supporting column clamped with the mounting groove and used for fixing the sampling bottle, a movable bolt used for locking the mounting groove and the supporting column, and a fixing assembly arranged on the inner side of the supporting column; and the sampling driving device is used for driving the movable fixing device to carry out sampling downwards. During sampling, the movable bolt is inserted into the locking hole, so that the support column and the mounting groove are fixed; then, the sampling bottle is placed in a mounting groove, and an adjusting screw rod is driven to enable a fixed clamping jaw to fix the sampling bottle; then, detachable connection between the supporting frame and the connecting driving plate is achieved through the elastic piece, under the action of the driving rod, the connecti