A condom for preventing body fluid intersection comprises an outer housing (1) provided with a sealed front end. A glans penis accommodating space is formed at the sealed front end of the outer housing (1). An inner casing (2) is disposed in the outer housing (1). The front end and the rear end of the inner casing (2) are both open. The diameter of the front end of the inner casing (2) is smaller than that of the rear end of the inner casing (2). The inner casing (2) is located at the rear part of the glans penis. At least the front end of the inner casing (2) is smaller than that of the housing (1). At least the inner casing (2) tightly binds the penis part behind the glans penis. The rear end of the inner casing (2) is connected to the outer housing (1), and a body fluid accommodating space (3) having an open front part is formed between the inner casing (2) and the outer housing (1). Also provided is a production tool for the condom. The condom can prevent the counter flow of the body fluid, and can improve the effects of contraception and disease spread prevention.