The utility model discloses a brake device of oil pumping machine belongs to the oil field oil recovery and equips technical field, and this brake device of oil pumping machine sets up on the driving license that stops personally experiences sth. Part of the body including the driving license body and the complementary unit of stopping, complementary unit, and complementary unit includes: speech control module, first suggestion control module, voice prompt module and switch on control module, first suggestion control module is connected with speech control module, switches on control module and is used for controlling first suggestion control module and sending first state control module 0 to speech control module when stopping driving license body stop work, speech control module is connected with the voice prompt module for send first pronunciation standby signal according to first state standby signal control voice prompt module, first pronunciation standby signal is used for indicateing operating personnel to keep away from the beam -pumping unit, has solved the lower problem of security of brake device of oil pumping machine brake, has realized the effect that improves the security of brake device of oil pumping machine brake, is used for the beam -pumping unit.