The 22-year-old goalkeeper had been out of contract this summer, but has now put pen-to-paper on new terms.
Kilmarnock boss Jim Jefferies also confirmed Bell's contract will be automatically extended by one year if he makes a certain number of starts in the coming SPL season.
"Cammy came in at Motherwell for the final game of the season and did very well. We believe he has a lot of potential," stated Jefferies.
"His contract is for a year and if he makes a certain number of starts he will get another year.
"He'll provide competition for Alan but Alan will want that to keep him on edge."