The invention provides a pressure testing device of a tappet body and belongs to the field of detection devices of the tappet bodies. The pressure testing device comprises a base and a dynamometer, wherein the base is provided with a lifting device which is fixedly connected with the dynamometer; the dynamometer is provided with a testing head. The pressure testing device also comprises a fixed sleeve which can be matched with the tappet body, wherein the fixed sleeve is arranged under the testing head; when the lifting device drives the dynamometer to move downwards, the testing head presses the tappet body. The pressure testing device provided by the invention has the advantages that the performance of pressure bearing of the tappet body can be well tested, the structure is simple, the operation is simple and convenient, the testing efficiency is improved, and the price is low, so that the production cost is greatly reduced.