Last year 51-year-old Kelvin Bull-De'ath had stabbed his girlfriend Marion Powell16 times after she broke off the relationship.
A Nursing Midwifery Council (NMC) hearing in Cardiff Friday said that confidence in the profession would be undermined if he was allowed to remain on the register.
Gill Barker, chair of the fitness to practice panel, said: "This was a most violent, premeditated and systematic attack that caused serious injury to the victim.
"The 16 stab injuries caused permanent scarring, loss of sense of smell and taste and had a significant psychological impact. [His] Conviction amounts to a serious departure from the relevant standards."
Bull-De'ath, who was employed as a nurse at Withybush Hospital, in Haverfordwest, used a blow torch to break into Powell's home in Pembroke Dock, just a few days after she ended their two-year relationship. Powell awoke, in the early hours of July 17, 2007, to see Bull-De'ath standing over her bed, shining a torch into her face, the panel heard.
The endoscopy unit nurse told the 52-year-old mother that he was going to kill her, before starting to stab her in the chest, back, shoulders and neck.
But when his knife snapped in her neck, she was able to flee downstairs, the Nursing Midwifery Council (NMC) was told.
She managed to contact her brother and sister-in-law, who eventually drove in, and Bull-De'ath stabbed himself in the abdomen in panic. Still he tried to escape, but was overpowered.
Claire Atogdina, the NMC panel's case presenter said: "The registrant was convicted of the most violent of crimes. They were entirely premeditated and caused a terrific amount of damage to the victim, both psychologically and physically. Although this does not call into question the registrant's professional practice as a nurse as he didn't cause any injury to any patient or in his work setting, it is a significant departure from the code of conduct."