The invention discloses an agricultural soil preparing device which comprises a bottom plate, an installation plate, an electric push rod, a furrow plow, an L-shaped pipe, a motor, a round plate, a swing rod, a smashing rake, a sector gear, a first rotating shaft, a sleeve, a first bevel gear, a second bevel gear, a stirring shaft and a first gear. By arranging the motor, the round plate, the swing rod, the sector gear, the first gear, the first rotating shaft, the sleeve, a water tank and a water pump, water and fertilizer are directly sprayed after soil preparing, the spraying range is large, work efficiency is improved, water and fertilizer spraying efficiency is improved, the growth of crops is facilitated, a stirring rod is driven by the stirring shaft to rotate forward and backward,liquid fertilizer is better dissolved in water, and the fertilizer utilization rate is increased; by arranging the smashing rake, an arc-shaped rack, a second gear, a spring and a flat floor, the smashing rake is driven by the swing rod to continuously swing, smashing is sufficient, the range is large, and the work efficiency is improved; by arranging the electric push rod and the installation plate, the soil preparing depth adjusting effect is achieved, and different agricultural planting requirements are met.