The invention relates to a plastic valve testing device, a plastic valve testing method and computer equipment. The plastic valve testing device comprises a rack, a pressure measuring mechanism, a torque measuring mechanism, a bending moment mechanism, a temperature environmental box, a control mechanism and a pair of sealing clamps. A supporting rod is arranged on the rack; driving boards which are driven by a first driving mechanism are arranged at two sides of the supporting rod respectively; the sealing clamps are used for sealing two sides of a to-be-tested valve, are provided with air holes for being communicated with an air source; the pressure measuring mechanism is used for measuring internal pressure of the to-be-tested valve and controlling on and off of the air holes and the air source; the torque measuring mechanism is used for twisting a valve stem of the to-be-tested valve; the rack, the bending moment mechanism and the torque measuring mechanism are arranged in the temperature environmental box. By the plastic valve testing device and method, rapid installation and accurate positioning of the valve can be achieved, the valve can be subjected to tests on sealing performance and torque performance at different temperature and pressure, and accordingly performance tests of the plastic valves can be achieved more accurately.