A flow guiding element for a heat collecting pump includes an annular portion and a plurality of flow guiding pieces connected to a periphery of the annular portion and arranged in a circumferential direction of the annular portion. Each of the plurality of flow guiding pieces has a flow guiding surface and a side surface connected to the flow guiding surface. The flow guiding surface spirals upwards in the circumferential direction of the annular portion, and the side surface is parallel to an axial direction of the annular portion.