Using two fiber tips and lens twice, An innovated double channel optical isolator has been advanced and fabricated, which duplicates the function in comparison with conventional optical isolator with single fiber tip. The typical insertion loss and isolation of the developed isolator are as good as that of the conventional optical isolator in theory. It was experimentally confirmed that forward insertion loss of two channels at 1550 nm are lower than 0.28 dB and 0.11 dB, backward isolation of that are over 55 dB and 54 dB respectively. It′s most important that the isolator, which can be fabricated with duplicated function and high characteristics, also have a low cost and a small volume comparatively.