a manufacturing method of biodegradable net - shaped articles includes : preparing a biodegradable mixture ; granulating the mixture into plastic grains ; baking the plastic grains in an oven at 60 ° c . to 70 ° c . for 3 to 4 hours ; melting and extruding the plastic grains by a screw - type extruder so as to obtain a net - shaped preform ; and cooling and thereby finalizing the net - shaped preform in a cooling bath at 15 ° c . to 30 ° c . so as to obtain the net - shaped article .