The invention belongs to the technical field of electric valve control, and particularly relates to an electric valve proportional control device and a control method. The control device comprises a processor module, a detection module, a control output module, a communication module, a storage module and a power supply module, wherein the detection module, the control output module, the communication module, the storage module and the power supply module are respectively connected with the processor module. The control output module comprises an electric valve switch circuit. The detection module comprises a control output power supply detection circuit and a valve current detection circuit. The communication module comprises a wireless communication circuit and a wired communication circuit. The electric valve proportional control device is simple in structure, novel in design, scientific, reasonable, low in cost and easy to maintain. Meanwhile, the electric valve proportional control device has the fault detection function. The invention further provides an electric valve proportional control method. The method can accurately realize the proportional adjustment, and is safe andreliable to use.