A bidirectional bill transmission channel device (02) with multi-path steering, which is arranged between an upper core (01) having functions of recognizing and separating bill and a lower core (03) for storing bill, is used for transmitting and separating bill in a reversing way. The device (02) comprises a channel bracket (0200), a power shaft (0203) mounted on the channel bracket (0200), a transmission belt (0202), channel boards (02041, 02042), an auxiliary transmission wheel set (0205) and a corner guide plate (0210), wherein floating wheels (0211, 0211') are provided in a steering transmission route formed by the corner guide plate (0210) and the power shaft (0203), the floating wheels (0211, 0211') correspond to the power shaft (0203) for transmission belt (0202), and form rolling fiction assembly with the belt (0202).