The invention relates to a method and a system for obtaining type selection parameters of a variable-pitch motor of a wind power generator, and a type selection method. The method comprises the steps of calculating blade root real-time wind loads Mz, variable-pitch bearing friction torques Mf, blade rotational inertia J and blade variable-pitch angular acceleration omega in all operation conditions; according to Mz, Mf, J and omega, calculating original blade root driving torques in the operation conditions; according to the original blade root driving torques, a reduction ratio of a whole variable-pitch system and transmission efficiency, calculating real-time torque values in the operation conditions; obtaining a maximum torque value of the variable-pitch motor of the wind power generator according to the real-time torque values; and performing root-mean-square processing on a torque and a speed of the variable-pitch motor in a normal power generation condition to obtain a mechanical characteristic curve of the variable-pitch motor, and performing variable-pitch motor type selection according to the maximum torque value of the variable-pitch motor and the mechanical characteristic curve of the variable-pitch motor. The method is simple and reliable; the operation conditions relatively conform to the actual operation conditions of the wind power generator; a result is relatively high in reliability; and the type selection of the variable-pitch motor of the wind power generator can be carried out more reasonably.