The direct measurement operation of plasma jet temperature is complicated and the particles types are easily disturbed, in this paper, the temperature characteristics of atmospheric discharge plasma jets are analyzed based on emission spectroscopy at different powers. The plasma emission spectra at different discharge powers are diagnosed by a pin-canister corona discharge device with air as the medium at a atmospheric pressure of 0.2 MPa. The vibration temperature and electron temperature of particles are calculated by Boltzmann slope method and bispectral intensity method, and the molecular rotational temperature is fitted by LIFBASE software. The results show that with the increase of power from 500 W to 1 000 W, the relative intensity of emission spectrum increases with power, and the types of active particles also increase, the vibration temperature of particles increase from 5 200 K to 7 000 K, and the electron excitation temperature increases from 16 700 K to 17 200 K, the fitting molecular rotation temperature is between 300 and 550 K. It is concluded that the discharge power directly affects the plasma jet temperature and particle type, and this study can provide reference for the application of plasma surface treatment.