@Gunner @Costas @PeteKnight
Thank you very much for participating in the discussion in these days and have provided me with a lot of help. I am very grateful to you, and I am sorry for my dedication to worry about you.
In fact, I have some way to solve this problem, but I think I should not casually put this method out, because I can not effectively prove that this method is valid.
I summed up your advice. Finally prepared to use the program + filter circuit to solve this problem.
I used the RC filter circuit to handle (do not know where) the interference. The effect is the LED cycle flicker (using 47uF capacitor and 90R resistor composition filter circuit), according to my calculations, the use of 1000uF capacitor and 200R resistance will be better.
And then use the program to deal with LED, 2 seconds there is a high level signal, then the LED will remain bright.
This is my current method, I really is no way, because I want to Nodemcu and 433m in a sealed box, the use of USB power supply.
If everyone has a better way to keep a message, I am happy to track and work together to solve this problem.
I believe there will be some friends in contact with Blynk when encountered a variety of problems.
Also I have sent an e-mail to me to buy the producer of the Nodemcu module to see if their engineers have no better way to deal with this strange interference.