The invention relates to a miniaturized single-bar end face pump pulse laser device used for laser ranging, illuminating and imaging. The laser device solves the problems that a traditional semiconductor end face pump pulse laser device for laser ranging and illuminating is low in efficiency and large in divergence angle and has to be subjected to temperature control. According to the technical scheme, parts including a single semiconductor bar, a first coupling lens, a second coupling lens, a laser device rear cavity mirror, a Nd:KGW laser crystal, a fold-back angle mirror, a polarizing film, an electro-optic Q regulating switch, a 1/4 wave plate and a laser device output mirror are sequentially installed on a laser device body to form a laser generation unit, and the laser generation unit is connected with a semiconductor laser device power source through a wire; a temperature sensor, an electric heating bar and a cooling fan are installed on a heat sink of the single semiconductor bar and connected with the semiconductor laser device power source. The pump pulse laser device can stably work in a large temperature range. The finished laser device product is small in size, low in weight, high in reliability and efficiency and widely applicable to the fields of laser ranging, illuminating, imaging and the like.