The invention provides an insert block for a blade, the blade and a wind generating set. The insert block for the blade comprises a connecting part provided with a connecting hole and an embedding part connected with the connecting part; the embedding part comprises an installation base and an embedding protrusion, the embedding protrusion is fixed to the installation base and extends in the radial direction of a blade root and extends in the first direction, and a first included angle is formed between the first direction and the blade root. By means of the insert block, increase of extra thickness of the blade root can be avoided, and the weight of the blade is reduced.