The invention discloses a butter pressure-injection machine, and relates to the technical field of bearing butter lubrication maintenance. A first compression cylinder is arranged in a frame. A motor and a gear oil pump are arranged on the two sides of the first compression cylinder correspondingly and are connected through a conveying belt. The upper end of the first compression cylinder is connected with an oil storage chamber. The oil storage chamber is provided with a suction and injection oil nozzle. A hydraulic oil tank is connected with the gear oil pump and a multi-path control valve through oil pipes. Compression chambers are arranged on the two sides of the multi-path control valve. Each compression chamber is provided with a second compression cylinder. The multi-path control valve is connected with the first compression cylinder, the gear oil pump and the second compression cylinders through a plurality of oil conveying pipelines. A recycling chamber is arranged below each compression chamber. According to the butter pressure-injection machine, an oil (air) cylinder is adopted as a movement component, the medical injector principle is adopted, butter is sucked into the oil storage chamber and then is injected into the specially-made space compression chambers, under driving of work of the oil (air) cylinder, the compression chamber space becomes small, and the butter is extruded into the bearing oil injection point.