The invention discloses a multichannel synchronous real-time digitalized photoacoustic imaging device and method. The multichannel synchronous real-time digitalized photoacoustic imaging device comprises a laser, a multi-element ultrasonic detector, a front amplification circuit and a data imaging processing unit, wherein the data imaging processing unit comprises a plurality of field programmable gate array (FPGA) acquisition cards, a clock synchronous board card, a programmable communication interface (PCI) extensions for instrumentation express (PXIe) backboard and a central processing unit (CPU) board card, and can be used for realizing acquisition processing for at least 32 paths of synchronous photoacoustic signals. The multichannel synchronous real-time digitalized photoacoustic imaging method comprises the following steps that: the multi-element ultrasonic detector receives the photoacoustic signals produced by laser irradiation on a biological tissue, amplifies the photoacoustic signals and respectively transmits the signals to the FPGA acquisition cards; and each FPGA acquisition card performs preprocessing, deconvolution, continuous wavelet transformation and photoacoustic attenuation compensation on the signals, then transmits the signals to another FPGA acquisition card in a peer-to-peer (P2P) manner, performs imaging processing by adopting a 2-D (two-dimensional) filtration back-projection algorithm, and finally transmits the structure to an upper computer. The method is finished on an FPGA processor; according to a modular design, the expansion of the large-scale detector is simplified; and the device and the method are favorable for clinical application of photoacoustic imaging systems.