A system for parallel power supply control for auxiliary converters of a motor train unit, comprising: a plurality of three-phase inverter modules, the output phase lines of the three-phase inverter modules being connected in parallel with each other; a plurality of switches (K1, K2, Kn), one switch being provided in each output phase line; a control system, wherein each of the three-phase inverter modules is connected to the control system; a plurality of connecting line modules, each connecting line module comprising a current transformer coupled to a corresponding output phase line of the three-phase inverter modules, and a resistor connected in parallel with the current transformer; wherein the current transformers of connecting line modules coupled to the output phase line of the same phase of two adjacent three-phase inverter modules are connected in parallel by two connecting lines, wherein for each connecting line module, a current sensor is provided which is coupled to one of the two connecting lines, wherein the current sensor is connected to the control system, wherein the control system is configured to gather a current value collected by each current sensor, and compare the phases and amplitudes of the current value of the same phase circuit of any two adjacent three-phase inverter modules; and if the phases and amplitudes of the current of the two adjacent three-phase inverter modules are unequal, calculate the difference of the phases and that of the amplitudes, and control the two inverter modules for automatic current sharing according to the calculation result until the phases and amplitudes of the current of the two adjacent three-phase inverter modules are equal; and execute the same operation as above on two parallel phase circuits of two adjacent three-phase inverter modules. a plurality of three-phase inverter modules, the output phase lines of the three-phase inverter modules being connected in parallel with each other; a plurality of switches (K1, K2, Kn), one switch being provided in each output phase line; a control system, wherein each of the three-phase inverter modules is connected to the control system; a plurality of connecting line modules, each connecting line module comprising a current transformer coupled to a corresponding output phase line of the three-phase inverter modules, and a resistor connected in parallel with the current transformer; wherein the current transformers of connecting line modules coupled to the output phase line of the same phase of two adjacent three-phase inverter modules are connected in parallel by two connecting lines, wherein for each connecting line module, a current sensor is provided which is coupled to one of the two connecting lines, wherein the current sensor is connected to the control system, wherein the control system is configured to gather a current value collected by each current sensor, and compare the phases and amplitudes of the current value of the same phase circuit of any two adjacent three-phase inverter modules; and if the phases and amplitudes of the current of the two adjacent three-phase inverter modules are unequal, calculate the difference of the phases and that of the amplitudes, and control the two inverter modules for automatic current sharing according to the calculation result until the phases and amplitudes of the current of the two adjacent three-phase inverter modules are equal; and execute the same operation as above on two parallel phase circuits of two adjacent three-phase inverter modules.