The invention provides a multistage multi-pump control method applied to a photovoltaic irrigation station. The multistage multi-pump control method applied to the photovoltaic irrigation station comprises the following steps: voltage values of photovoltaic cells are acquired; when the voltage values of the photovoltaic cells reach the start voltage, effectiveness of start signals is judged; afterthe start signals are judged to be effective, a self-adaption searching algorithm is adopted to calculate searching voltage with maximum power; searching control of MPPT maximum power is performed through the searching voltage, and an output frequency is calculated; tracking control and frequency outputting are performed through the output frequency; when solar energy exists, a first pump of first-stage pumps is controlled to start firstly; when the water pressure of water pipes of second-stage pumps is built, a first pump of the second-stage pumps is started; when energy is enough, a secondpump of the first-stage pumps is started; when the water pressure of the water pipes of the second-stage pumps is built again, the second pump of the second-stage pumps is started, and all water pumpsare started in sequence; and when the energy is insufficient, the second-stage pumps are stopped, and then, the first-stage pumps are stopped until all the pumps are stopped. The multistage multi-pump control method applied to the photovoltaic irrigation station is stable and reliable in system and high in utilization rate of the solar energy.