An apparatus is provided to extract radioactive solid particles. An extracting nozzle is used to extract radioactive solid particles. Then, a separator is used to separate out the radioactive solid particles into a storing container. The radioactive solid particles are avoided from entering a suction pump. Not only the suction pump is not polluted, but also the secondary waste is not increased. By designing a falling inlet of a suction channel at a position having a specific height, the amount of the radioactive solid particles being extracted is under control. There is a radiation-protection device outside of the storing container to minimize radiation dose. The separator and the storing container can be rapidly detached by remote operation, so that operators are avoided from receiving over-dose radiation. Hence, the present invention improves the level of technology and automation for handling radioactive waste.