An integrally formed coupling module is provided. In the module, a total internal reflective surface reflects a first optical signal emitted by a laser to form a second optical signal, the second optical signal is output to the medium air interface, a medium air interface refracts the second optical signal to form a third optical signal, the third optical signal is output from air to the air medium interface, an air medium interface refracts the third optical signal to form a fourth optical signal, and then the fourth optical signal is output to an optical fiber. In addition, a refractive angle at which the medium air interface performs refraction to form the third optical signal is equal to an incidence angle at which the third optical signal is output to the air medium interface, and a first incident surface and a second incident surface are mutually perpendicular in space.