Pixel driving circuit, driving method thereof and display apparatus

A pixel driving circuit comprising an electroluminescent element, a driving transistor, a switch unit, a charging unit, a compensation unit, a cutoff unit and a storage unit, wherein

• the switch unit is configured to control data voltage writing of a data line, a first terminal of the switch unit is connected to the data line, and a second terminal of the switch unit is connected to a first terminal of the charging unit, a first terminal of the compensation unit, a first terminal of the storage unit and the gate of the driving transistor respectively;
• the charging unit is configured to control a driving power source to charge the storage unit, and a second terminal of the charging unit is connected to the driving power source and a first terminal of the electroluminescent element respectively;
• the cutoff unit is configured to cut off electric connection between the electroluminescent element and the source of the driving transistor, a first terminal of the cutoff unit is connected to a second terminal of the electroluminescent element, and a second terminal of the cutoff unit is connected to the source of the driving transistor;
• the compensation unit is configured to pre-store a threshold voltage of the driving transistor into the storage unit, and a second terminal of the compensation unit is connected to the source of the driving transistor;
• and
• the drain of the driving transistor and a second terminal of the storage unit are grounded.