The invention discloses a device for compressing a chirp entangled photon pair. The device comprises a continuous laser device, wherein a first convex lens, a first nonlinear crystal, a second convex lens, a first light filter, a first collimator, a liquid crystal-spatial light modulator, a second collimator, a third convex lens, a second nonlinear crystal, a fourth convex lens, a second light filter, a fifth convex lens, a single-photon detector and a photon counter are sequentially arranged on a light path at one side of the continuous laser device. The invention further discloses a compressing method adopting the device. According to the device and the method for compressing the chirp entangled photon pair disclosed by the invention, the compression effects are the same as that of a traditional phase compensation scheme; and the defects that the compression result is limited by the dispersive medium length and the dispersive higher-order term and the loss is generated when an entangled photon signal passes through a dispersive medium in the traditional phase compensation scheme are overcome.