Light source with illuminating angle and image reading device

The invention provides a light source with an illuminating angle. The light source comprises LED substrates; a light emitter is arranged on each LED substrate; a light guide body is connected with the LED substrates through connecting parts; each connecting part comprises an LED substrate connecting face, a light guide body connecting sleeve and a component groove; each LED substrate is connected with the LED substrate connecting face of the corresponding connecting part; each light emitter is positioned in the corresponding component groove; the end parts of the light guide body are inserted into the light guide body connecting sleeves; the light guide body comprises a main body part; a reflection image layer is arranged on the bottom surface of the main body part; a plurality of tapered light guide bodies, which are unconnected with one another and arranged in a linear manner, are arranged on the upper surface of the main body part; the distance between center lines of every two adjacent tapered light guide bodies is 1-2 mm; the center lines of the tapered light guide bodies are inclined relative to the upper surface of the main body part, and the degree of an inclined angle depends on an incidence angle of lights required by anti-counterfeiting mark identification. The light source with the illuminating angle can set the incidence angle of the lights required by anti-counterfeiting mark identification.