An electromagnetic drive blade apparatus , comprising: a blade ; and a drive coil , configured to receive a drive signal, and configured to drive, by using the drive signal, the blade to swing, wherein when a frequency of the drive signal is different from a resonance frequency of the blade , the drive coil is configured to receive a new drive signal, and is configured to drive, by using the new drive signal, the blade to swing, and a frequency of the new drive signal is the resonance frequency, further comprising: a detection coil and a power amplification unit, wherein the detection coil is coupled and connected to the drive coil , and is configured to detect an induced voltage generated when the blade swings; and two input ends of the power amplification unit are respectively connected to two ends of the detection coil , two output ends of the power amplification unit are respectively connected to two ends of the drive coil , and the power amplification unit is configured to obtain the new drive signal after performing power amplification on voltages at two ends of the detection coil , and apply the new drive signal to the two ends of the drive coil , wherein the electromagnetic drive blade apparatus further comprises an automatic gain control unit, and the automatic gain control unit comprises a first input end, a second input end, and an output end, wherein the first input end is connected to the detection coil , the first input end is configured to receive the voltages at the two ends of the detection coil , the second input end is connected to the drive coil , the second input end is configured to receive voltages at two ends of the drive coil , and the output end is connected to an input end of the power amplification unit; and the automatic gain control unit is configured to: under control of the voltages at the two ends of the drive coil , output a voltage whose frequency is the same as a voltage of the detection coil by using the output end. a blade ; and a drive coil , configured to receive a drive signal, and configured to drive, by using the drive signal, the blade to swing, wherein when a frequency of the drive signal is different from a resonance frequency of the blade , the drive coil is configured to receive a new drive signal, and is configured to drive, by using the new drive signal, the blade to swing, and a frequency of the new drive signal is the resonance frequency, further comprising: a detection coil and a power amplification unit, wherein the detection coil is coupled and connected to the drive coil , and is configured to detect an induced voltage generated when the blade swings; and two input ends of the power amplification unit are respectively connected to two ends of the detection coil , two output ends of the power amplification unit are respectively connected to two ends of the drive coil , and the power amplification unit is configured to obtain the new drive signal after performing power amplification on voltages at two ends of the detection coil , and apply the new drive signal to the two ends of the drive coil , wherein the electromagnetic drive blade apparatus further comprises an automatic gain control unit, and the automatic gain control unit comprises a first input end, a second input end, and an output end, wherein the first input end is connected to the detection coil , the first input end is configured to receive the voltages at the two ends of the detection coil , the second input end is connected to the drive coil , the second input end is configured to receive voltages at two ends of the drive coil , and the output end is connected to an input end of the power amplification unit; and the automatic gain control unit is configured to: under control of the voltages at the two ends of the drive coil , output a voltage whose frequency is the same as a voltage of the detection coil by using the output end. <EOS>