Scott Dekraai, 44, a former tugboat operator, entered his pleas to eight counts of murder and one count of attempted murder with special circumstances and enhancements in Orange County Superior Court.
Prosecutors have said they will seek the death penalty.
Dekraai's lawyer says his client entered the pleas to spare victims' relatives from sitting through a trial.
However, he said Dekraai will fight to keep from being sentenced to death.
Dekraai donned a bulletproof vest before heading to the Seal Beach salon where his ex-wife worked as a stylist in October 2011. Authorities said he shot and killed Michelle Fournier before turning his gun on the salon's owner and spraying Salon Meritage with bullets.
"'I know what I did,'" he told an arresting officer, according to a police affidavit.
The salon reopened about a year later, with six of the original employees returning to work.
Since the shootings, victims' relatives have pleaded with the judge at numerous hearings to hasten the case to trial. In March, Judge Thomas M Goethals severed the guilt and penalty phases to prevent additional delays as Dekraai's lawyer Scott Sanders argues motions related to prosecutors' efforts to seek the death penalty.
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