In a medium bowl, dissolve the strawberry Jell-O in boiling water. Let cool to room temperature.
In a large bowl, combine the crushed pretzels, melted butter, and ¼ cup of sugar. Press firmly into the bottom of a 9x13-inch baking dish.
Bake for 8-10 minutes until golden brown. Cool to room temperature.
In a large bowl, beat the cream cheese and ½ cup of sugar until light and fluffy, about 2-3 minutes. Gently fold in the Cool Whip. Spread over the cooled crust.
Arrange the sliced strawberries evenly over the cream.
Pour the Jell-O mixture over the top. Cover and refrigerate for at least 2 hours, or until completely set.