The specific step of making thousand-layer cake with potato flour are as follows:

1. Peel the purple sweet potato or sweet potato, steam it on a dish and stir it into sweet potato paste;

2. Add sugar into the sweet potato paste and stir the sweet potato paste until the sugar melts;

3. Add sweet potato paste, sweet potato powder and appropriate amount of water into the basin and stir until it is muddy;

4. Put a spoonful of potato pulp into a steaming basin, boil and steam for about three minutes, put a layer of coconut juice and steam for about three minutes, then put another layer of potato pulp until it is dry, cool and cut into pieces.