Herbert G. Schoepke, 57, who was chief trial lawyer for the antitrust divisin of the Justice Department in several cases involving major banks and their holding companies, died Thursday after a long illness.

After transferring to the antitrust division from the internal security division in 1960, Mr. Schoepke litigated antitrust cases involving large banks in the nation.

Jack O'Donnell, a lawyer who worked with Mr. Schoepke, said the cases were tests of the Clayton Act, which prohibits mergers that result in lessening competition between corporations.

He described Mr. Schoepke as an expert in antitrust cases involving banks.

Mr. Schoepke joined the Justice Department in 1953 as a member of the deputy attorney general's office. he then went to the internal security division, doing trial work around the country. He received commendatioons for his trial work from U.S. attorneys in Illinois, Colorado and Washington state.

Mr. Schoepke began his law career with Pruitt, DesVerine and Coursent, a New York law firm. He then worked for Allied Chemical Company before going to the Justice Department.

A 1940 graduate of Middlebury College and a 1947 graduate of Harvard Law School, Mr. Schoepke served in the Navy as a lieutenant commander and was on a carrier for three years in the Pacific during World War II.

He was a member of the New York, American and Federal bar associations and the National Lawyers Club. He belonged to the Kent Island (Md.) Yacht Club and the Kenwood Country Club.

He is survived by his wife, Audrey, three children, Susanne, Steven and Philip, all of the home in Bethesda.