Construction union boss John Setka has been charged with more than 20 additional offences of breaching a court order.

Mr Setka, the Victorian state secretary of the CFMMEU, was already facing charges of recklessly causing injury and using a carriage service to harass a woman.

Union boss John Setka outside Melbourne Magistrates Court last month. Credit:Joe Armao

He is alleged to have injured the woman on July 30, 2017, while the other charge relates to October 29 last year.

Senior police prosecutor Paul Brookes told the Melbourne Magistrates Court on Wednesday that an additional 27 charges of breaching a court order have been laid after more allegations were made by the same complainant.