High peak power radially polarized laser pulse is obtained from a passively Q-switched microchip laser with composite structure of YAG/Nd∶YAG/Cr4 +∶YAG crystal and photonic crystal grating mirror as the polarization-selective output coupler. The average output power is 435 mW and a slope efficiency is 15.7%. The laser pulse output has a maximum peak power of 15.7 kW, a minimum pulse duration of 3.2 ns, and repetition rate of 8.1 kHz at absorbed pump power of 6.5 W. The polarization degree of the radially polarized pulse is measured to be as high as 95.8% . All of the crystals in the experiment are <111> cut which is more beneficial for this laser to improve the uniformity of output radially polarized beam.