The invention provides a method for quickly obtaining data of a set top box, which comprises the following steps of: starting up a demultiplexing module of the set top box to receive a control block of data; dynamically distributing the internal memory which is 1.5-2.5 times as the size as the date from the system; configuring the distributed internal memory to be a buffer receiving zone of the demultiplexing module for receiving the data; writing the date with a plurality of bytes into the place which is far away from the end of the dynamically distributed internal memory to be taken as the mark of a buffer zone; arranging the demultiplexing module to receive all portioning data, wherein a receiving mode is an uninterrupted receiving mode; and directly sending the received data into the corresponding buffer zone of the module before stopping the demultiplexing module, etc. The method receives the data with a cascade receiving principle, and receives a plurality of parallel unreceiveddata, thereby improving the whole receiving speed.