Lens type lighting system of short-focal-length liquid crystal display (LCD) projector

The invention discloses a lens type lighting system of a short-focus LCD projector. The lens type lighting system comprises an LED light source, a light source lens, a Fresnel lens, a heat insulation lens, an LCD and a projection lens which are sequentially arranged at intervals. The distance between the LED light source and the light source lens is 3 mm, the distance between the light source lens and the Fresnel lens is 56.2 mm, the distance between the Fresnel lens and the heat insulation lens is 2 mm, and the distance between the heat insulation lens and the LCD is 2.5 mm. The light source lens is small in size, obstruction to air during heat dissipation can be reduced, airflow circulation is improved, and heat dissipation of a light source is facilitated; the light source lens is made of a high-transmittance glass material, so that the illumination efficiency is remarkably improved; the light source lens adopts a deformed aspheric surface design, so that the illumination light-emitting angle is large and