The invention discloses an automatic pipe arrangement assembly machine for a radiator core body. The automatic pipe arrangement assembly machine comprises a rack, a cross beam and a pipe bin, wherein the cross beam passes through a cross beam sliding track; a sliding block is mounted on the rack; a cross beam ball screw and a cross beam servo motor for driving the cross beam ball screw to rotate are arranged at the upper part of the rack; a nut sleeve on the cross beam ball screw is fixed on the cross beam to control the cross beam to move; the pipe bin is arranged on the cross beam, directly faces two rows of positioning needles and comprises pipe grooves, a pipe bracket, a pipe bracket fixing plate, a pipe bracket air cylinder, pipe poking pieces and pipe blocking pieces; the pipe bracket fixing plate is arranged between the two pipe grooves; the pipe bracket is buckled on the pipe bracket fixing plate; the pipe bracket air cylinder is fixed on the pipe bracket fixing plate; the pipe bracket is controlled to move vertically by the pipe bracket air cylinder; the pipe poking pieces and the pipe blocking pieces are arranged at the lower parts of the pipe grooves. According to the automatic pipe arrangement assembly machine disclosed by the invention, the fact that radiating pipes are automatically arranged guide pipe plates and the pipes are automatically poked to enable the radiating pipes to fall into positioning grids among the positioning needles is realized through the pipe bin and sequential operation is realized to complete assembly through PLC control, so that the labor intensity of workers is reduced and the working efficiency is improved.