1. A method for verifying quality of server, used for verifying a plurality of servers constructed in a server cluster, and the method for verifying quality of server comprising: installing a cloud computing platform in the servers in the server cluster, wherein the cloud computing platform comprises a cloud computing platform file system and a mapreduce frame; creating an input file folder on the cloud computing platform file system and storing a calculation data into the input file folder; creating a plurality of mapreduce tasks corresponding to a calculation job by the servers, accessing the calculation data in the input file folder, and distributively executing the mapreduce tasks by using the mapreduce frame to obtain a plurality of calculation results; storing the calculation results; and analyzing the calculation results to verify a quality of each of the servers; wherein the servers comprise a main server and a plurality of node servers, wherein the step of creating the mapreduce tasks corresponding to the calculation job by the servers, accessing the calculation data in the input file folder, and distributively executing the mapreduce tasks by using the mapreduce frame to obtain the calculation results comprises: dividing the calculation job into the mapreduce tasks by the main server; assigning the mapreduce tasks to the node servers; and executing the mapreduce tasks respectively by the node servers.