Dose throwingup cause weight loss

Yes, in the short term. Whatever comes up will not contribute to your weight, the same way that urinating or defecating will "make you lose weight".

The health effects of bulimia (the medical term for causing yourself to throw up on purpose) are severe. Throwing up is unhealthy and will cause electrolyte imbalances, damage to the esophagus, and pitting of the teeth, among other problems. In severe or long-term cases, death can occur.

You're better off following a reasonable diet plan under a doctor's supervision. If you need to use vomiting to control your weight, then it's time to seek help from a friend or trusted counselor.