The utility model relates to a quantitative pollination device is assisted to fruit tree, belong to the fruit tree cultivation techniques field, which has the advantages of simple structure, high durability and convenient use, can accurate controlled pollination volume, effectively practice thrift pollen be used for pear tree supplementary pollination can quantitative pollination device, the technical scheme who adopts installs powder inlet pipe for dosing pipe's top, the last check valve of installing of powder inlet pipe, the connecting seat is installed at powder inlet pipe's top, be connected with pollen can on the connecting seat, the intake pipe is installed to dosing pipe's one end, be connected with the gasbag in the intake pipe, be provided with the check valve in the intake pipe,install the handle frame in the intake pipe, be provided with the piston in the dosing pipe, be provided with the connecting pipe on the piston, the connecting pipe is connected with dosing pipe, install the dropping liquid needle tubing on the connecting pipe, it is protruding to be provided with the location on the connecting pipe, still be provided with on the connecting pipe and be used for blockking the bellied fixed sleeving in location, fixed sleeving and dosing pipe threaded connection, the utility model discloses extensively be used for the pollination of pear tree.