The invention relates to air conditioner filed, in particular to an intelligent control method of air conditioner. By overcoming the shortcomings of the prior art, the invention needs not to develop multiple selection systems corresponding to multiple system requirements or manually set the selection system by dial-up, jumping wire, and other methods, instead, the invention utilizes a general control mainboard to perform automatic detection of system number in accordance with air inlet temperature, air outlet temperature, air inlet pressure, air outlet pressure that are fed back from the compressor, overload protection quantity and other parameters, and then invokes the corresponding control program to control, so that one control mainboard is general for multiple-type or multi-system air-conditioning system, and the problems in the prior art including complex types, various dial-up codes, complex wiring, and complex production, debugging and maintenance of the control mainboard can be solved. In addition, aiming at multi-system and multi-compressor air conditioner, the intelligent control balances the compressors to perform controlling function, so that the service life of complete air conditioning unit is prolonged and the reliability is also improved.