The invention discloses a multichannel analog signal generator, which comprises a PC interface (1), a power source interface (2), a power source module (3) electrically connected with the power source interface, a CPU and a storage unit (4) thereof and an output interface (11), wherein the input ends of the CPU and the storage unit (4) are electrically connected with the PC interface (1) and the power source module (3), while the output ends are electrically connected with an FPGA execution module (5) and the output interface (11) in turn; and the FPGA output end of the FPGA execution module (5) is electrically connected with a square wave output module (6), a random wave output module (7), a frequency collection module (8), a voltage output module (9) and a voltage input module (10). The multichannel analog signal generator has the advantages of integrated design, small volume, stable and reliable operational performance, high automation degree, low cost, energy conservation, and the like, and is particularly suitable for a detection test bed of a monitoring system for various large-sized transport and communication facilities.