The sentence is not wrong but in my opinion I would prefer to say "I have not laughed this much in my whole life"

Hi Farhana, The past participle of "laugh" is "laughed". So the correct way to say it should be "I haven't laughed this much in my whole life". The expression itself however sounds very natural and this would be how a native speaker usually says it. Another way to say it with the same meaning could be "I never laughed this much in my whole life" in which you used the past tense of the verb. I hope that this helps you and should there be any other questions you are welcome to ask! Regards, Teacher Daniel

I have never laughed this much in my whole life.