The utility model discloses a combined type anchor rod suitable for a loess side slope. The combined type anchor rod suitable for the loess side slope comprises a main rod, wherein a grouting hole is formed in the middle of the main rod. A plurality of slurry discharging holes are formed in the main rod and penetrate through the main rod in the radial direction. The slurry discharging holes are formed from the front end of the main rod to the rear end of the main rod in sequence in the mode that the hole intervals are gradually increased. The rear end of the main rod is connected with an anchoring pretightening force exerting device. According to the combined type anchor rod suitable for the loess side slope, cement slurry or cement mortar or water glass slurry can be injected into loess around the main rod through the grouting hole and the slurry discharging holes of the main rod, so that root pile structures are formed, and therefore the tensile strength of the anchor rod can be greatly improved; in addition, due to the fact that the root pile structures provide more supporting points for the main rod, the bending strength of the main rod is enhanced, and the anchor rod is not prone to deformation in use; the slurry discharging holes are formed from the front end of the main rod to the rear end of the main rod in sequence in the mode that the hole intervals are gradually increased, more root pile structures are arranged on the front section of the main rod, the ability, to resist the loess saturated yielding deformation, of the root pile structures are higher, and the combined type anchor rod is not prone to being broken.