The invention relates to the technical field of illumination, in particular to an LED diffuse reflection triple-prevention lamp. The LED diffuse reflection triple-prevention lamp comprises a shell body, wherein the shell body is integrally formed by aluminum profiles. The integrally formed shell body is provided with five folded edges. The first folded edge and the fifth folded edge are parallel to each other. The free end portions of the first folded edge and fifth folded edge are thickened inwards. Clamping grooves are arranged on the inner sides of thickened ends. First installing grooves are arranged at positions, corresponding to the clamping grooves, outside the thickened ends. Inclined planes are arranged on the inner sides of the thickened ends and provided with first concave clamping grooves. A V-shaped clamping groove is arranged at the junction of the thickened end of the first folded edge and a straight edge of a folded edge. A V-shaped clamping groove is arranged at the junction of the thickened end of the fifth folded edge and a straight edge of a folded edge. Installing grooves are arranged at the inner sides of bending portions of all folded edges respectively. Thethird folded edge is symmetrically provided with a pair of concave clamping grooves. The diffuse reflection triple-prevention lamp is simple in structure, high in light emitting rate, soft in light, free of glare, waterproof, dustproof and capable of avoiding falling.