To make a birthday surprise box, you need to prepare cardboard, colored paper, scissors, glue, colored pens and other materials. First, make a square box out of cardboard and cut it out with scissors. Then, decorate the outside of the box with colored paper and colored pens. You can write greetings or draw birthday patterns. Put a small gift or toy in a box and decorate it with trinkets. Then make the box cover and stick it together. Finally, check the integrity of the box and repair the damaged parts in time. Pack with colored paper and other materials to keep the mystery.