The invention provides an adjustable-speed generator motor rotor core punching sheet bonding method. Through the features that low-viscosity brushing glue is low in adhesiveness and good in liquidity and can be cured at a room temperature, and by utilizing siphonage effect after lamination of rotor core punching sheets, the glue is allowed to flow between the punching sheets automatically, and all rotor core punching sheets can be bonded together, so that relative displacement of the generator motor rotor core punching sheets due to influence of centrifugal force, electromagnetic force and convergent force during operation thereof is effectively prevented. The method simplifies adjustable-speed generator motor rotor core punching sheet gluing process. The low-viscosity brushing glue has good shearing strength, and can cooperate with a core tie bolt to jointly prevent relative displacement between the punching sheets. The adjustable-speed generator motor rotor core punching sheet bonding technology fills a domestic gap in the field.