The invention discloses a multi-point data transmission system based on wireless spread spectrum communication. Both a transmitting terminal and a receiving terminal employ modular software and hardware designs, main signal processing work of the system is realized in a programmable logic device, a hardware structure is simplified, and system power consumption and volume are reduced. Simultaneously, the receiving terminal employs digital intermediate frequency reception technology to sample a signal at intermediate frequency, instant processing signal bandwidth in the digital intermediate frequency reception technology is substantially increased, a dynamic range is large, expandability is good, flexibility is high, simultaneously since a simulation link is reduced in a receiver, noise introduced from a front end is reduced, signal distortion is lessened, and a circuit is more concise. The receiving terminal employs a mode of carrying out parallel processing on received data, modularization of a software processing process is realized, and to different transmitting terminals, accurate reception can be realized only modifying a plurality of parameters. Simultaneously, a system capacity expanding method is simple, when quantity of the sending terminals is increased, and correspondingly increasing receiving terminal software modules is enough.