The invention discloses a hydraulic oil cylinder buffer device. The hydraulic oil cylinder buffer device comprises a hydraulic oil cylinder, a variable pump, an oil tank, electromagnetic proportion throttles, a three-position four-way reversing valve, an electromagnetic valve and a programmable logic controller. A first oil opening and a second opening of the hydraulic oil cylinder is connected with an opening A and an opening B of the three-position four-way reversing valve correspondingly through pipelines. An opening P and an opening T of the three-position four-way reversing valve are connected with the variable pump and the oil tank correspondingly. The electromagnetic valve is connected with the three-position four-way reversing valve so as to control a valve core of the three-position four-way reversing valve to move. The electromagnetic proportion throttles are connected to an oil inlet and an oil outlet of the hydraulic oil cylinder correspondingly. The programmable logic controller controls valve cores of the electromagnetic proportion throttles to move. The hydraulic oil cylinder buffer device can buffer hydraulic shock generated due to sudden increase of oil pressure in a cylinder barrel, so that the comfort of manipulation of hoisting equipment is improved. In addition, hydraulic shock of an oil return pipeline due to inertia can be buffered, and thus the service life of an oil return side pipeline is prolonged.