An assembly assisting device for assisting an assembling of at least two wind turbine components of a wind turbine is provided. The assembly assisting device includes at least one bolt magazine with at least one bolt magazine store unit for storing bolts for the assembling and at least one bolt magazine attaching unit for attaching the bolt magazine to at least one attaching structure of at least one of the wind turbine components. In addition, a method for assembling at least two wind turbine components of the wind turbine with following steps is provided: a) providing of the wind turbine components and providing of at least one assembly assisting device including bolts and b) assembling of the wind turbine components with the aid of the bolts of the bolt magazine store unit of the assembly assisting device.