We introduce photon addition excited the superposition of coherent states (PASCT) by operation of photon addition on the superposition of coherent states with the sa me amplitude but two different phases.We derive the normalized constant of PASCT and its anal ytical expression of Wigner function.The influence of the average photon number of coherent stat e and phase difference on its Wigner function is investigated.The conclusions are obtained through numerical simulations as follows:The negative region and the negative depth of Wigner function of PASCT are sometimes strengthened and sometimes weakened with increase of th e phase difference,and the negative volume of Wigner function of PASCT displays quasi- periodic evolution with the phase difference.On the other hand,as the average photon nu mber in coherent state increases,the negative region and the negative depth of Wigner function ar e strengthened,and the negative volume of Wigner function of PASCT increases also,which implies th at its non-classicality is strengthened with the increase of the average phot on number.