The invention relates to a heatless AWG preparation method based on a curved array waveguide grating. The method comprises the following steps: using at least one input waveguide, input planar waveguide, array waveguide and output planar waveguide and N-numbered output waveguides to form a curved AWG chip; bonding and solidifying the curved AWG chip on an interlayer; performing coupling and debugging with the input waveguide and output waveguide of the curved AWG chip, solidifying; cutting into two parts, namely a first AWG chip and a second AWG chip; cementing the second AWG chip with a substrate; arranging the first and second AWG chips in parallel along the parting line direction; adjusting the central wavelength of the curved AWG chip to be ITUT wavelength, separately solidifying compensation rods on the first AWG chip and the substrate; and taking the prepared heatless AWG from the jig. The temperature compensation structure prepared by the method of the invention can overcome changes of the optical performance caused by the deformation of the chip and the performance stability of elements are increased; and the structure is simple, the operation is convenient, and the methodof the invention is applicable to industrial production.