The invention provides a well mouth protection net which comprises a net body and fixing parts which are continuously arranged around the edge of the net body. Due to the fact that the well mouth protection net is arranged at a well mouth, under the condition that ventilation is not affected, pedestrians and abnormal objects can also be prevented from falling into a well, and therefore potential safety hazards are lowered, and personnel injury accidents are reduced. Meanwhile, the well mouth protection net has the advantages of being simple in structure and low in manufacturing cost.