The present invention discloses a construction method by using a sandbox as the temporary support for a continuous beam, comprising the following steps: (a) preparing a sandbox; (b) putting sand in a steel cylinder layer by layer, striking by a small hammer to increase the density, sleeving the steel cylinder with a steel tube of an upper shim plate when the sand reaching the desired height; (c) prepressing the sandbox; (d) allocating the sandbox; (e) constructing a continuous beam; (f) discharging the sand. The use of the sandbox as temporary support for the continuous beam avoids the hardening of ground or the pouring of concrete and is free from the construction environment, the pier body can be used in soft soil layer or riverway. Compared with temporary pier, the sandbox has simple structure, convenient fabrication and high construction efficiency. The use of the sandbox as temporary support for continuous beam can effectively reduce the construction difficulty when the pier bodyis high, thereby increasing the safety factor.