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Aiming at the problems of low rotor positioning accuracy and poor stability during acceleration phase of the lawn mower motor during the start-up process, a high-frequency square wave injection start strategy for the hand-push lawn mower is proposed. The paper divides the start of the lawn mower motor into two stages, low speed and high speed, and extracts the high frequency response current under the αβ shaft system at different sampling points for rotor position estimation. This method does not require a filter and reduces the position estimation error. Based on the injection of positive and negative pulses, the paper proposes a method for judging the polarity of the d-axis when the motor is started for the first time. Using the STM32F302 chip to build a hardware experimental platform, the experimental results show that the improved pulse injection rotor polarity discrimination method can accurately determine the rotor polarity, and the optimized integrated current processing strategy can effectively estimate the rotor position, improve accuracy, and meet requirements for starting the lawn mower motor.