The invention provides a multi-point smooth motor speed evaluation method which mainly comprises the steps as follows: over-sampling to the output of an encoder is carried out according to an over-sampling factor M; subsequently, average processing to a plurality of over-sampling results is carried out so as to obtain an initial speed evaluation value; finally, low-pass filtration processing to the initial speed evaluation value is carried out so as to obtain the final speed evaluation value which is sent to a speed controller, thus controlling the motor speed. Furthermore, the invention can also use two over-sampling factors to carry out the over-sampling processing respectively; subsequently, according to the average values of the results of the two over-sampling factors, one of the results of the two over-sampling factors is used selectively. The method of the invention can greatly improve the jumping problem of measurement during the high-speed running of the motor.