To provide a method for manufacturing a catalyst for exhaust gas treatment remarkably excellent in initial performance (catalytic activity at starting of exhaust gas treatment) and capable of maintaining the catalytic activity at the high state for a long period of time, in a method for newly preparing a catalyst by crushing the used catalyst for exhaust gas treatment of titanium-vanadium system having the deteriorated catalytic activity and molding the obtained powder.

The method for obtaining the catalyst for exhaust gas treatment comprises molding and calcining the powder of the catalyst containing a titanium based oxide and a vanadium based oxide. The powder of the catalyst used for the exhaust gas treatment and having the deteriorated activity is used as at least a part of the powder for newly preparing the catalyst. An aqueous solution of an inorganic acid and/or an organic acid is added to the powder in a process to a calcination step.

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