The invention discloses an assembly line device for performing Hartmann wave-front sensor first-moment mass center operation on an image sensor having the characteristic of target surface pixel transverse multi-channel parallel output. The assembly line device comprises an X-direction multiplying-accumulating unit, a Y-direction multiplying-accumulating unit, a pixel value accumulating unit, an X-direction division unit, a Y-direction division unit and an address and control unit, wherein the X-direction multiplying-accumulating unit and the Y-direction multiplying-accumulating unit have the same structure and respectively comprise a multiplier group unit and two accumulating units with the same structure; the pixel value accumulating unit consists of two accumulating units with the same structure; the X-direction division unit and the Y-direction division unit have the same structure and consist of a stand-alone divider respectively; and the address and control unit consists of a control table unit, an X-direction address generating unit, a Y-direction address generating unit and a control signal generating unit. Due to the adoption of the assembly line device, an assembly line for performing mass center operation on a plurality of pixels output in parallel by a plurality of channels is constituted, the mass center operation delay of each frame of image is only the calculation delay of a last clock output pixel, the quantity of operation units can be conveniently adjusted according to the quantity of channels output in parallel by pixels, and adaptation to image sensors with different quantities of output channels is realized.