Triggering automatic floating benthic shrimp and crab sample trapper

The invention discloses a triggering automatic floating benthic shrimp and crab sample trapper, and provides a trapper which is small in catch and convenient in operation, and can automatically float and realize automatically sampling after shrimps are captured. The trapper comprises a support frame and a plurality of automatic floating catchers arranged on the support frame. The automatic floating catcher comprises a vertical stop collar arranged on the support frame, a mesh shrimping cylinder inserted in the vertical stop collar, a gravity ball, and an automatic release device arranged on the mesh shrimping cylinder. The upper part of the outer side surface of the mesh shrimping cylinder, above the vertical stop collar, is provided with an upper limiting block. The middle part of the bottom surface in the mesh shrimping cylinder is provided with a conical limiting guide sleeve whose cross section area gradually reduces from bottom to top. The upper end and the lower end of the conical limiting guide sleeve are provided with openings. The middle part of the bottom surface of the mesh shrimping cylinder is provided with a shrimp inlet corresponding to the lower end port of the conical limiting guide sleeve. The mesh shrimping cylinder is provided with a floating device which makes the mesh shrimping cylinder float.