The invention provides a method for measuring the code execution time of a pulse width modulation strategy of a DSP vector control system and specifically relates to a method for measuring the real-time code execution time of a pulse width modulation method in a motor vector control system based on a DSP. The method is characterized in that the execution time of a code segment can be measured in real time under the circumstance that the motor control system runs, in case of steady-state operation of the motor vector control system, the execution time of the code segment of the pulse width modulation method under each electrical angle value in an individual electrical angle period can be measured by setting an electric angle change step length, and the whole measurement process can be realized by use of the resources of the DSP without other peripheral device. The method for measuring the code execution time of the pulse width modulation strategy of the DSP vector control system has the advantages of accurate measurement result, good instantaneity, simple measurement method and the like.