The invention provides portable direct-current charging equipment for electric cars and a method for restraining the input power of the portable direct-current charging equipment. According to the portable direct-current charging equipment, a charging equipment body and an alternating current input cable are of separated design and are connected in an opposite insertion mode, and thus a plurality of sets of input cables with different specifications can be provided for the portable charging equipment. Due to uniqueness of an alternating current input power connection socket, the charging equipment body can and only can be connected with one set of alternating current input cable each time, the risk that other plugs are suspended in a charged mode is avoided, and personal safety of clients is ensured. According to the method for restraining the input power of the portable direct-current charging equipment, the portable direct-current charging equipment automatically identifies identifiers of the input cables so as to confirm the specifications of the input cables, the output power can be controlled through comparison with BMS feedback power after charging, thus, the charging equipment body can restrain the input power automatically according to the specifications of the input cables, and application risks caused by manual misoperation are avoided.