The utility model belongs to the technical field of signal generation of a power system and relates to a multichannel high-speed synchronous D/A (digital to analog) conversion output device. The device comprises a GPS (Global Position System) clock, a function controller, at least six logic controllers, at least six memories and at least six D/A converters. The GPS clock is connected with the function controller. The function controller is respectively connected with the logic controllers. Each logic controller is connected with at least one memory and at least one D/A converter. The memories and the D/A converters are connected in pairs. High-precision time calibration and synchronous output can be provided.