The invention relates to a digital seismic detector based on a computer network, and is used for solving the problems of high cost, high power consumption and poor function of the traditional seismic detector. The digital seismic detector consists of a central control operating system, root nodes, main nodes, base stations, a power supply station used for supplying power to an acquisition chain, the acquisition chain, optical cables and a big-cable unit; the central control operating system is connected with the root nodes through a plurality of bonded gigabit lines; the root nodes are connected with the main nodes and other field ground equipment through a plurality of the optical cables; a plurality of the main nodes are connected through gigabit optical cables to form a backbone network; the main nodes are connected with the base stations through large line cables; the base stations are connected through 100M big cables to form a secondary backbone network; the base stations provide a plurality of special synchronous transmission interfaces for connecting the acquisition chain and the power supply station; the acquisition chain consists of a plurality of acquisition stations; and the base stations have the function of the power supply station and are used for supplying power to the acquisition chain. In the invention, the data transmission of the backbone network is completed by adopting gigabit optical fiber, the data transmission of the secondary backbone network is completed by adopting the 100M cables, and the real-time data transmission of the acquisition chain is realized by adopting a similar token ring. The digital seismic detector has the advantages of low cost, low power consumption, strong function and capability of realizing data transmission of a 100-thousand-grade digital seismic detector in a reliable mode.