The invention discloses a self-propelled grass block baling machine, which belongs to the field of agricultural machinery. The self-propelled grass block baling machine mainly comprises a base plate part, a cab, a picking-up and conveying part, a feeding part, a compressing and knotting part and a power transmission part, wherein the base plate part is fixedly arranged below a frame; the cab is arranged in front of the frame; and the compressing and knotting part is arranged on the middle part of the frame. The power of the entire machine comes from an engine. According to the self-propelled square grass baling machine, the turning radius is reduced to a great extent by using a self-propelled design and rear wheel steering, and dry grass pick-up and baling combined operation at plots with small planting areas at mountain areas is facilitated; by using hydraulic speed changing and hydraulic steering, a driver can realize larger steering force control by using smaller operation force through the hydraulic speed changing and the hydraulic steering; the traveling speed can be adjusted in real time in operation according to the condition of swath thickness; in addition, the dynamic load of a transmission system is greatly relieved, the vibration is reduced, the situation that the engine works at the optimal working point is guaranteed, and the vehicle dynamic property, the fuel oil economy and the working efficiency are favorably improved; and the self-propelled square grass baling machine has the advantages of safe and reliable performance, and easiness, convenience and flexibility in operation.