The invention provides a stabilization method of a DC (direct current) microgrid system containing multiple parallel DC-DC converters. Firstly, modelling is performed on the DC microgrid system containing the multiple parallel DC-DC converters; because the system is not stable, the stabilization method in the mode of a constant voltage source is proposed. By means of design of duty cycle of the system, the system is stabilized on the premise that system voltage is not decreased; a Jacobian matrix is acquired according to a node voltage and current equation, partial derivative of current for voltage and a circuit structure equation of the system, a characteristic polynomial is solved out, the range of influence on system parameters is solved out according to the Sylvester's inertia law and the Rayleigh's minimax principle, and finally, the stability domain of the system is determined. Compared with a method requiring feedback of a message of CPLs communication in the prior art, the method has the advantage that the cost is saved; besides, the stability of the DC microgrid system containing the multiple parallel DC-DC converters is improved.