The invention relates to a multiport access and storage controller for a multiprocessor. The multiport access and storage controller comprises an instruction channel, wherein an input terminal of the instruction channel is connected with an output terminal of a peripheral DMA (Direct Memory Access) channel of the multiprocessor and an output terminal of a kernel DMA channel of the multiprocessor respectively, an output terminal of the instruction channel is connected with an input terminal of an arbitration module, an output terminal of the arbitration module is connected with an input terminal of a memory array, an output terminal of the memory array is connected with an input terminal of a data channel, and an output terminal of the data channel is connected with an input terminal of the peripheral DMA channel of the multiprocessor and the input terminal of the kernel DMA channel of the multiprocessor respectively. The invention further discloses a control method for the multiport access and storage controller for the multiprocessor. According to the multiport access and storage controller and the control method, an effective response mechanism is provided for concurrent requests of multiple DMA channels, and the characteristics, namely the real time of request response and the full utilization of memory bandwidth, are all taken into account, so that the throughput rate of access and storage data can be increased, and wait time resulting from address conflict is reduced.