The invention discloses a land governance system for saline-alkali lands in desert areas. The system comprises four salinity blocking fences of which head and tail parts are connected successively to form a planting area through enclosing, wherein a hollow water storage room is disposed inside each salinity blocking fence; the water storage rooms communicate mutually; a drip irrigation pipe is disposed under the planting area; two ends of the drip irrigation pipe communicate with bottoms of the water storage rooms; and water injection connectors are disposed on tops of the salinity blocking fences respectively. Application of the system disclosed by the invention has the beneficial effects that a salinity-blocking waterproof layer is paved under soil in the planting area, so salinity in lower-layer soil can be effectively prevented from evaporating with moisture and returning to upper-layer salt-leaching soil in seasons with small precipitation; a rainwater collection device is used to collect and store rainwater, and then the rainwater is used for irrigation via the drip irrigation pipe, so that the salt-leached soil still keeps certain moisture and planted crops will not dry up to die; and the drip irrigation pipe is just located under furrows in which crops are planted, so that the moisture overflowed from the drip irrigation pipe will be directly absorbed by the crops, and evaporation waste of the moisture is avoided.