The invention discloses an excitation method of a superconducting magnet for a superconducting cyclotron, belongs to the field of particle cyclotron acceleration and solves the problem of quenching easily caused in a primary excitation process. Firstly, a corresponding excitation current is calculated according to magnetic field intensity. Then, excitation is operated to the superconducting magnetfor many times, and the input current of each excitation is 4% to 5%, 8.5% to 9.5%, 20% to 25%, 40% to 50% and 100% of the excitation current in sequence. The excitation method of the superconductingmagnet for the superconducting cyclotron avoids the problem of the quenching easily in the primary excitation to required magnetic field intensity through progressive excitation. The limit field strength of the superconducting magnet can be obtained through an exploratory excitation method and through the limit field strength, the magnetic field intensity can be guided to reach the primary excitation without exceeding the limit field strength in subsequent excitation. Through the excitation method of the superconducting magnet for the superconducting cyclotron, the risk of quench loss in theprogressive excitation is small. The problem of the quenching can be completely avoided according to the excitation method of the superconducting magnet for the superconducting cyclotron to carry outthe excitation, so that the amount of liquid helium produced and consumed is greatly saved because of quenching.