The invention relates to the technical field of lasers, and provides a non-resonant subnanosecond pulse laser. The laser comprises a voltage-decreased Q modulating module, a pumping source as well asa pumping coupling unit, a dichroic mirror, a laser gain medium, a Q switch and a reflecting mirror which are arranged along the direction of a transmitting light path of the pumping source in sequence; the pumping coupling unit is used for focusing pumping light transmitted by the pumping source onto the laser gain medium through the dichroic mirror, the dichroic mirror is arranged slantly, and ahigh transparency film is coated at the end, facing the dichroic mirror, of the laser gain medium; and the voltage-decreased Q modulating module is electrically connected with the Q switch. The hightransparency film is coated at the end, facing the dichroic mirror, of the laser gain medium, the pumping coupling unit is used for being focused onto the high transparency film completely after passing through the dichroic mirror, laser light can be output inside the cavity through once transition, the pulse width is effectively controlled, and the single pulse energy is further improved. Moreover, due to the fact that the voltage-decreased Q modulating module is adopted in the laser, a 1/4 wave plate does not need to be arranged.