Combine pretzels, sugar and melted butter in a medium-size bowl. Mix well. Press the mixture into the bottom of a 13 x 9-inch baking dish. Bake the pretzel crust for 15 minutes or until lightly toasted.
Remove the dish to a wire rack and cool completely. Beat together the cream cheese and confectioners' sugar in a large bowl. Fold in the whipped topping and miniature marshmallows. Spread the mixture with a spatula over the crust in an even layer.
Bring water to boiling in a medium-size saucepan. Add gelatin and stir to dissolve. Add strawberries. Pour over second layer in dish. Refrigerate until firm.