The landmark law creates a 10-member Fast Food Council with equal numbers of workers' delegates and employers' representatives, along with two state officials, empowered to set minimum standards for wages, hours and working conditions in California.
Newsom said he was proud to sign the measure into law on Labor Day.
"California is committed to ensuring that the men and women who have helped build our world-class economy are able to share in the state's prosperity," he said in a statement.
"Today's action gives hardworking fast food workers a stronger voice and seat at the table to set fair wages and critical health and safety standards across the industry.".
The law caps minimum wage increases for fast-food workers at chains with more than 100 restaurants at $22 an hour next year, compared to the statewide minimum of $15.50 an hour, with cost of living increases thereafter.
Sen. Brian Dahle, the Republican nominee for governor in November, had called it "a steppingstone to unionize all these workers.".
But supporters of the legislation hailed it as a big win for workers, with Assemblywoman Luz Rivas calling it a "watershed moment" for labor. »