The total reflection tunnel effect of the electromagnetic wave in 1D square photonic crystal has been studied. The transmissivity of the electromagnetic wave incident into the 1D square photonic crystal with a incident angle greater than the full reflection angle has been calculated by using the transition matrix method. The total reflection tunnel effect has been found in the transmission wave. The change of the total reflection tunnel effect of square photonic crystal versus the quantum number of mode, the length of side and the period has been investigated. The obtained results provide the theoretical basis for designing the high quality photonic crystal filter.