The invention provides a marine-use trawl for fishing megalobrama terminalis. The trawl comprises a mesh trawl bag, wherein the mesh trawl bag is fixed by upper and lower head net ropes; a trawl hanging nose is connected to the front end of the mesh trawl bag; one end of the trawl hanging nose is connected with a trawl stay cord, and the other end of the trawl hanging nose is connected with a trawl leading wall; an upper head rope and a lower head rope are connected on the trawl leading wall, and are respectively connected with floats and weights to form a trawl mouth; splayed head leading ropes are connected to upper and lower sides of the trawl mouth, extend inward and are connected with a big inward inverted whisker opening; inward inverted whiskers are arranged on the big inward inverted whisker opening, extend inward and are connected to a small inward inverted whisker opening; the small inward inverted whisker opening is fixed by an inward inverted whisker opening stay cord; and the opening of the trawl mouth becomes bigger when the splayed head leading ropes are pulled by the trawl leading wall, the trawl hanging nose and the trawl stay cord, and fish is poured out from the fish outlet.