The invention discloses an agricultural digging machine with high stability. The agricultural digging machine comprises a working plate, wherein a through groove is formed in a top part of the working plate, U-shaped plates are fixedly connected with four corners at a bottom part of the working plate, rotation rods are movably connected with two sides of an inner wall of each U-shaped plate, a turning wheel is fixedly connected onto a surface of each rotation rod, a first fixed plate is fixedly connected with the top part of the working plate and is arranged at a left side of the through groove, a second fixed plate is fixedly connected with the top part of the working plate and is arranged at a right side of the through groove, and a sliding groove is formed in a right side of the first fixed plate. By arranging the sliding groove, a sliding rod, a sliding block and a connection plate, the sliding block on the connection plate moves on the sliding rod during moving of the connection plate, the connection plate can move in a vertical direction and is difficult to deviate and incline, pits dug by the digging machine are uniform in size, the fixing of agricultural plant is facilitated, and the stability of the agricultural digging machine is better.