An electromagnetic drive blade apparatus, comprising: a blade; and a drive coil (120, 402), 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 (120, 402) 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 (120, 402), 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 (120, 402), 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 (120, 402), 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 (120, 402), the second input end is configured to receive voltages at two ends of the drive coil (120, 402), 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 (120, 402), 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 (120, 402), 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 (120, 402) 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 (120, 402), 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 (120, 402), 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 (120, 402), 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 (120, 402), the second input end is configured to receive voltages at two ends of the drive coil (120, 402), 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 (120, 402), output a voltage whose frequency is the same as a voltage of the detection coil by using the output end.