The invention discloses a side topdressing machine which comprises a fertilizer barrel, fertilizer discharge hoses, a bearing frame, a bearing wheel, a push handle, fertilizer control switches, a positioning device and a roller device, wherein the fertilizer barrel is fixedly connected with the bearing frame and comprises a fertilizer holding chamber, two fertilizer outlets are formed in the bottom of the fertilizer holding chamber and in the bottom of the fertilizer barrel, the fertilizer control switches are arranged at the fertilizer outlets, each fertilizer outlet is correspondingly connected with the fertilizer discharge hose, one ends of the fertilizer discharge hoses are connected with the fertilizer outlets while the other ends of the fertilizer discharge hoses are connected with the roller device, the push handle is fixedly connected with the upper part of the bearing frame, the bearing wheel is connected with the bearing frame, and the bearing wheel is arranged below or below the rear side of the bearing frame. The side topdressing machine can quickly and uniformly apply the fertilizer into soil deeply, thus perfectly combining speed and quality.