The invention discloses a method for absorbing and separating nickel by using a dinitrogen amide hydrazone pyridine derivative. The method comprises the following steps: an absorbing agent is mixed with nitric acid water solution containing multiple metal ions; nickel ions in the nitric acid water solution are absorbed and separated by the absorbing agent; and the absorbing agent is prepared by loading a compound, expressed as a formula I, on a carrier. Each gram of absorbing agent is mixed with 20-30 ml of nitric acid water solution. The carrier is a weak-polarity macroporous resin. In the nitric acid water solution, the concentration of nitric acid is 0.4-6 M. The concentration of each metal ion is 5.0*10<-4> to 1.0*10<-3> M. The method for absorbing and separating the nickel by using the dinitrogen amide hydrazone pyridine derivative can absorb and separate the nickel from an acid water phase, and is high in selectivity, simple in operation, high in separation efficiency and suitable for industrial separation and recovery of precious metal-transition metal nickel.