Campbell, 31, left Hull City at the end of the season and had been keeping fit with the BetVictor Premier N/West side before securing a move to the Championship club, who were relegated from the top flight last year.
He said in a message to the club’s players: "Thanks for having me and all the best for the up coming season."
Brighouse were the East Division play-off winners last term, but missed out on promotion due to having an inferior points per game record across the step four leagues.
They open up this campaign with a trip to Clitheroe on Saturday, before welcoming Marske United to St Giles Road on Monday.
Manager Vil Powell said: "The whole squad is raring to go and so am I. Opening games to a season are cagey affairs and we can expect a tough one in difficult conditions. I am sure the selected players will give a good account of themselves, however.”
Powell has added 19-year-old midfielder Masai Arbouin to his squad.
Arbouin, who joins from Swallownest and has previously played for Sheffield, has been with Brighouse during pre-season.