The invention provides a apatite type fluorescent material. According to the fluorescent material, samarium element is doped into chlorapatite, so that the fluorescent material can emit red light which is large in light intensity and long in fluorescent lifetime and can be used as a luminescent material for LED (Light Emitting Diode) lamps. The invention further provides a method for preparing the fluorescent material. All raw materials are mixed, then sintered through a high-temperature solid-state method and finally smashed to obtain the fluorescent material. The method is simple to operate, achieves one-step reaction and is high in product yield.