A pollen harvesting machine having a motorized chassis on which there are mounted heads for harvesting pollen by suction, which heads are connected by a suction circuit to a separation cyclone, which is connected to a suction fan. The separation cyclone is associated with a pollen recovery hopper. Each head comprises an assembly of a suction hood which has a generally frustroconical portion, which widens between an upper opening which is connected to the remainder of the suction circuits of the machine, and a polygonal base.