Daniel Huwiler and Oswald Jonas used 41,680 dominoes to build a wall 38 metres long and one metre high in a gym in the town of Häggenschwil, 20 Minuten reported on Monday.
The world record for the longest domino wall is currently 30 metres, the newspaper said.
The record attempt will be made on Saturday.
“If a single domino budges before that day, everything will collapse,” Hulwiler told 20 Minutes.
The teenagers spent 10 hours a day for a week-long period to build the wall, which was finished ahead of schedule.
Hulwiler said the work is hard on the back and requires a lot of patience.
The two friends discovered their passion for dominoes seven years ago when they started with a collection of 200.
Now they have 75,000 which they store in a specially rented room, 20 Minutes said.