Additive manufacturing method of TiAl alloy blade

The invention relates to an additive manufacturing method of a TiAl alloy blade. Comprising the following steps: establishing an initial blade unit model, carrying out margin design on the initial blade unit model to obtain a blade unit model, then carrying out height compensation design on the blade unit model to obtain a height-compensated blade unit model, and adding a supporting structure at the edge of the bottom of a blade crown of the height-compensated blade unit model to obtain a height-compensated blade unit model; and finally, the target blade unit models are placed in an array mode, and a target printing model is obtained. Slicing and scanning path planning are conducted on the target printing model, and slicing data and scanning path planning data are imported into additive manufacturing equipment; the TiAl alloy powder is subjected to particle size matching, and the selected TiAl alloy powder is loaded into additive manufacturing equipment; wherein the particle size of the selected TiAl alloy po