We have created report for account and when we try to export into excel, it is fetching only 1millions cells data into excel.
Is there any limitation in Qlik sense for exporting the data into Excel?
it is not the limitation of sense, it is the limitation of excel.
who needs more than 1 million records in details?
If you have more than a million rows, Excel isn't the way to go, at least not just dumping the whole lot onto one sheet.
See Microsoft limitations for excel:
Retrieving data ...