A method for measuring a thickness of a subcutaneous tissue, comprising: emitting ultrasonic detection waves inwards from a skin surface, and acquiring ultrasonic echo signals of the ultrasonic detection waves; determining, according to ultrasonic parameter values of the ultrasonic echo signals and a characteristic parameter threshold of a subcutaneous tissue, the moment the ultrasonic echo signals from the boundary of the subcutaneous tissue are received; and calculating a thickness of the subcutaneous tissue according to the moment the ultrasonic echo signals from the boundary of the subcutaneous tissue are received, wherein determining, according to ultrasonic parameter values of the ultrasonic echo signals and a characteristic parameter threshold of a subcutaneous tissue, the moment the ultrasonic echo signals from the boundary of the subcutaneous tissue are received comprises: calculating a first mean of ultrasonic parameter values of N consecutive ultrasonic echo signals starting from the first ultrasonic echo signal received after the ultrasonic detection waves are emitted, wherein N is a positive integer; if the first mean is greater than a first threshold value, taking the N ultrasonic echo signals as a first group of signals, and calculating a second mean of ultrasonic parameter values of N consecutive ultrasonic echo signals following the first group of signals; if the second mean is less than a second threshold value, determining the moment the last ultrasonic echo signal in the first group of signals is received as a first moment of reception and the moment a first ultrasonic echo signal following the first group of signals is received as a second moment of reception; and determining an intermediate moment between the first moment of reception and the second moment of reception as the moment the ultrasonic echo signals from the boundary of the subcutaneous tissue are received. emitting ultrasonic detection waves inwards from a skin surface, and acquiring ultrasonic echo signals of the ultrasonic detection waves; determining, according to ultrasonic parameter values of the ultrasonic echo signals and a characteristic parameter threshold of a subcutaneous tissue, the moment the ultrasonic echo signals from the boundary of the subcutaneous tissue are received; and calculating a thickness of the subcutaneous tissue according to the moment the ultrasonic echo signals from the boundary of the subcutaneous tissue are received, wherein determining, according to ultrasonic parameter values of the ultrasonic echo signals and a characteristic parameter threshold of a subcutaneous tissue, the moment the ultrasonic echo signals from the boundary of the subcutaneous tissue are received comprises: calculating a first mean of ultrasonic parameter values of N consecutive ultrasonic echo signals starting from the first ultrasonic echo signal received after the ultrasonic detection waves are emitted, wherein N is a positive integer; if the first mean is greater than a first threshold value, taking the N ultrasonic echo signals as a first group of signals, and calculating a second mean of ultrasonic parameter values of N consecutive ultrasonic echo signals following the first group of signals; if the second mean is less than a second threshold value, determining the moment the last ultrasonic echo signal in the first group of signals is received as a first moment of reception and the moment a first ultrasonic echo signal following the first group of signals is received as a second moment of reception; and determining an intermediate moment between the first moment of reception and the second moment of reception as the moment the ultrasonic echo signals from the boundary of the subcutaneous tissue are received. calculating a first mean of ultrasonic parameter values of N consecutive ultrasonic echo signals starting from the first ultrasonic echo signal received after the ultrasonic detection waves are emitted, wherein N is a positive integer; if the first mean is greater than a first threshold value, taking the N ultrasonic echo signals as a first group of signals, and calculating a second mean of ultrasonic parameter values of N consecutive ultrasonic echo signals following the first group of signals; if the second mean is less than a second threshold value, determining the moment the last ultrasonic echo signal in the first group of signals is received as a first moment of reception and the moment a first ultrasonic echo signal following the first group of signals is received as a second moment of reception; and determining an intermediate moment between the first moment of reception and the second moment of reception as the moment the ultrasonic echo signals from the boundary of the subcutaneous tissue are received.