The utility model provides a downhole feeder for temporary blocking and energization processing of a heavy oil steam huff and puff well. The downhole feeder comprises a pipe body, wherein a space for containing solid temporary-blocking materials is formed in the pipe body, a box coupling is arranged at the upper end of the pipe body, a pin is arranged at the lower end of the pipe body, and a limiting steel ring is arranged inside the pipe body in a welding mode, is arranged at the position close to the pin, and is used for bearing the weight of the solid temporary-blocking materials. When the downhole feeder is used, the solid temporary-blocking materials can be fed to the downhole position needing the solid temporary-blocking materials in an accurate positioning mode, temporary blocking and energization processing can be carried out, pertinence is high, construction is easy, multiple effects are integrated, the cost is low, and the remarkable energization effect can be achieved.