First get your blood sugar levels done as high triglycerides are found in diabetics also.
If there is no diabetes
,then you have to resort to some lifestyle changes like...
Avoid sweets,colas,junk foods like pizzas and burgers and deep fried foods.
Reduce the use of sugar from your diet.
Do brisk walking for at least 40 minutes a day.
Take more of fresh fruits and green vegetables.
Reduce your weight and be in the required range of your BMI.