The invention provides a battery module multichannel synchronous detection device, which comprises a main controller, a signal detection module, an external communication interface module and a clock control system, wherein the main controller is connected with the battery module and the clock control system via the signal detection module and the external communication interface module respectively; and under effects of the clock control system, the main controller controls the signal detection module to synchronously detect parameters of each battery in the battery module. The detection device provided by the invention has a strong anti-interference ability; synchronous detection of multiple battery module parameters and synchronous and real-time detection of multiple parameters for each battery in the battery module can be realized; the channel number of the detection device is improved; and the device can be used by a user in a large-scaled synchronous detection situation.