The invention discloses a reaction incubation device, an immunity analyzer and a reaction incubation method. The reaction incubation device comprises a reaction unit (10), which is used for bearing and incubating a reaction container; and a transfer unit (20), which is used for removing the reaction container in and out of the reaction unit (10). The reaction unit (10) comprises a rotating device (11). The rotating device (11) is provided with an incubation position which increases a predetermined angle θ at an interval of fixed time T along with the rotating device (11). The transfer unit (20) removes the reaction container out of the incubation position according to variable incubation time ti. With the device, flexible and variable incubation time can be achieved, and the problem of complicated control, low reliability and that high-speed automation is not easy to achieve in the prior art can be solved.