The invention belongs to the technical field of detection equipment for an oil field, and particularly relates to a pressure testing machine for a propping agent test. The pressure testing machine comprises a main engine frame (1), wherein a transmission system (2) is arranged on the main engine frame (1); the transmission system (2) comprises a motor (201) which is connected with a synchronous gear; the synchronous gear is connected with a speed reducer (205); the speed reducer (205) is connected with a lead screw assembly; the lead screw assembly is connected with a cross beam adjusting mechanism (3); a pressing plate assembly (4) is arranged on the cross beam adjusting mechanism (3). The pressure testing machine has the advantages that the transmission is reasonable, the adjustment is convenient, and the machine is suitable for various tests on a propping agent.