The invention discloses a tire crane auxiliary system and a control method. The tire crane auxiliary system comprises a single-cylinder bolt control valve, an auxiliary arm variable-amplitude oil cylinder, a control cabin variable-amplitude oil cylinder and an air conditioner motor, a constant-pressure pump is connected with a two-position two-way valve, and an oil outlet of the constant-pressurepump is connected with the first priority valve; the first priority valve is respectively connected with the single-cylinder bolt control valve and a second priority valve, the second priority valve is respectively connected with an electric proportional three-position four-way valve II and a third priority valve,the third priority valve is respectively connected with an electric proportional three-position four-way valve III and an electric proportional two-position two-way valve IV, and the electric proportional two-position two-way valve IV is connected with the air conditioner motor. According to the present invention, different priorities are set for all the auxiliary actions, several actions can be controlled at the same time, but also the flow can be preferentially supplied to the system with the high priority. The beneficial effects are that the flow priority distribution can be better realized, so that the multi-action compounding is realized; the automatic speed regulation ofthe actions, such as fly jib amplitude variation, control cabin amplitude variation, air conditioning, etc., is realized; the responsiveness of the system is improved, and the waste of the redundantflow is avoided.