The invention discloses a spacing adjustable grain lifter. The spacing adjustable grain lifter comprises grain lifter bodies and grain lifter shafts, the grain lifter bodies are arranged at the front ends of the grain lifter shafts, the spacing adjustable grain lifter further comprises universal joints, the universal joints are arranged between the grain lifter bodies and the grain lifter shafts, one end of each universal joint is connected with the corresponding grain lifter shaft, and the other end of each universal joint is connected with the corresponding grain lifter body. Compared with an existing spacing constant grain lifter, the spacing adjustable grain lifter can better adapt to the condition that the spacing between peanut seedlings is large, can harvest peanuts with different line spacing, and is high in adaptability.