  We calculate the flux of cosmic positrons from the dark matter annihilation
in the littlest Higgs model with T-parity. The dark matter annihilates mainly
into weak gauge bosons in the halo, and high energy positrons are produced
through leptonic and hadronic decays of the bosons. We investigate a
possibility to detect the positron signal in upcoming experiments such as
PAMELA and AMS-02. We found that the dark matter signal can be distinguished
from the background in the PAMELA experiment when the dark matter mass is less
than 120 GeV and the signal flux is enhanced due to a small scale clustering of
dark matter. Furthermore, the signal from the dark matter annihilation can be
detected in the AMS-02 experiment, even if such enhancement does not exist. We
also discuss the invisible width of the Higgs boson in this model.
