Peanuts are a secondary crop as a production crop. Along with the development of technology, there is a need for a tool that can help and ease the process of breaking down peanut shells. With a peanut shell breaker designed with a capacity of 40 kg/hour. The process of breaking peanut shells is carried out by inserting peanuts that have been separated from their stems and have undergone a drying process directly into the inlet funnel of the crushing machine, where inside the crushing machine there is a cylinder that rotates at a certain speed. The breaker cylinder is equipped with straight breaker teeth which function to break the peanut shells. The bottom of the breaker cylinder is equipped with a sieve and blower which moves based on the motor shaft transmission