The differences between broad beans and soybeans are as follows:

1. Color and shape. The skin of broad beans is usually green, tan or black and has various shapes, which can be nearly rectangular or nearly round; the pods of soybeans are light yellow or green in color and have a relatively elongated shape.

2. Nutritional content. Both broad beans and soybeans are good sources of plant protein, but the protein content of broad beans is slightly lower than that of soybeans, about 10%, while the protein content of soybeans is about 20%; the fat content of broad beans is lower than that of soybeans, about 15% of carbohydrates. The compound content is higher than that of soybeans, about 7%; broad beans are rich in vitamins B1, B2 and B6, while soybeans are rich in nutrients such as iron, potassium and calcium.

3. Purpose. Broad beans can be processed into various snacks, such as Tianjin black beans, while soybeans can be eaten or extracted for oil, and are often used as raw materials for the production of soy products and edible oil.