The invention discloses a particle material spreading device. The particle material spreading device is characterized by being formed by connecting multiple conveying hoses into spreading units; each spreading unit is formed by installing an impact plate and a fixing clamp on a spreading pipe and installed on a square pipe through the fixing clamp, and one end of each square pipe is connected with a lengthening square pipe; each conveying hose is connected into the corresponding spreading unit; each impact plate is composed of a first side impact plate body, a top impact plate body and a second side impact plate body; each fixing clamp is formed by arranging an upper V-shaped clamp plate on a lower V-shaped clamp plate, V-shaped grooves of each fixing clamp are oppositely arranged to form a square groove, the square pipes can be placed in the corresponding square grooves, and the spreading units are fastened to the square pipes through fasteners. According to the spreading device, two purposes of seeding and fertilizing on one machine can be achieved, ordered arrangement is achieved, the spreading width and the installation positions can be adjusted as needed, uniform spreading of particle fertilizer or seeds is achieved, and equipment cost is effectively reduced.