The invention discloses a flexible LED lamp strip assembly. The flexible LED lamp strip assembly comprises a flexible lamp strip and a flexible supporting part, the flexible lamp strip is arranged onthe flexible supporting part, the flexible supporting part comprises a plurality of strip-shaped plastic plates, an embedding shaft is arranged at the front end of each strip-shaped plastic plate, anembedding groove corresponding to the corresponding embedding shaft is concavely formed in the rear end of the corresponding strip-shaped plastic plate, the plurality of strip-shaped plastic plates are connected end to end in sequence through matching of the embedding shafts and the embedding grooves, L-shaped clamping seats located on the two sides of the flexible lamp strip are symmetrically arranged on each strip-shaped plastic plate, the flexible lamp strip comprises a flexible circuit board and LED lamp cores, and the LED lamp cores are arranged on the flexible circuit board at intervals.According to the flexible LED lamp strip assembly, through the above mode, the flexible lamp strip is clamped on the flexible supporting part, the embedding shafts are matched with the embedding grooves, so that bending of the flexible supporting part and supporting on the flexible light strip are facilitated, the adaptability to a construction space and the environment is good, the structure isstable, and the anti-knock effect during use is improved.