A grout switching valve of a grouting trolley comprises a supporting frame, a conveying pipe, a handle and a rotating shaft. The supporting frame is fixed between a high-speed grout manufacturing barrel and a low-speed grout storing barrel. The supporting frame is provided with a hole A with which the rotating shaft is sleeved. The lower portion of the rotating shaft stretches out of the hole A and is fixedly connected with the conveying pipe. The upper portion of the rotating shaft stretches out of the hole A and is fixedly connected with the handle. The bottom of the handle abuts against the supporting frame. The rotating shaft and the conveying pipe are movably supported on the supporting frame through the handle. The handle drives the conveying pipe to swing through the rotating shaft, the conveying pipe swings relative to the supporting frame, and a discharging port is aligned with the high-speed grout manufacturing barrel or the low-speed grout storing barrel. In the work process, the switching of the grout flow-out direction is achieved mainly in the manner that the handle drives the rotating shaft to rotate so as to enable the conveying pipe to swing. Due to the fact that a valve element or other fine parts are not contained in the conveying pipe, grout does not need to pass a mechanical movable part in a switching valve body in the grout conveying process, and it is avoided that the grout enters the mechanical movable part, and consequently the valve body is clamped and damaged. Meanwhile, the structure is simple, cost is low, and installing and maintaining are convenient.