The invention provides a tunable high-energy monopulse double-half-Gaussian hollow laser, which comprises a pump source, a coupling optical system, an input mirror, a laser gain medium, an electro-optical crystal and a diffractive optical element. A laser beam emitted from the pump source is coupled into the laser gain medium through a coupling optical system in a way of end-face pumping manner. The input mirror is a plane mirror and forms a laser resonace cavity together with a diffractive optical element, and the diffractive optical element is used to select the intensity distribution of thelaser beam in the cavity and to output the giant pulsed double-half Gaussian hollow beam outside the cavity as an output coupling mirror. An annular positive electrode and an annular negative electrode are arranged at both ends of the electro-optical crystal. The invention has the advantages of avoiding the phenomenon of 'light leakage' when a realistic light beam passes through the center of anelectro-optical crystal; So that the extinction ratio of the Q-switched device is no longer dependent on the Q-switched device in the Q-switched process; the Single Giant Pulse All-Solid-State HollowLaser Output can be tuned; Compared with traditional electro-optic Q-switched lasers, it has higher single pulse energy.