A poker card turning mechanism of a poker machine, characterized by the poker card turning mechanism comprising a first card discharge pressing wheel, a card turning wheel, a card turning pressing wheel, and a second card discharge pressing wheel, wherein the card turning wheel is a driving wheel and is driven to be turned by a card turning motor, the first card discharge pressing wheel, the card turning pressing wheel, and the second card discharge pressing wheel are all driven wheels, the first card discharge pressing wheel and the card turning pressing wheel are in rolling contact with the card turning wheel, the second card discharge pressing wheel and the card turning pressing wheel are in rolling contact, a first card discharging passage is formed between the card turning wheel and the first card discharge pressing wheel, a card turning passage is formed between the card turning wheel and the card turning pressing wheel, a second card discharging passage is formed between the card turning pressing wheel and the second card discharge pressing wheel, the card turning wheel is installed on an inner side of the card turning passage and is located between the first card discharging passage and the second card discharging passage, the card turning passage extends along part of an arc circumference of the card turning wheel from one side of the card turning wheel close to the first card discharging passage to the other side of the card turning wheel away from the first card discharging passage, a card turning component configured to open or close an outlet of the first card discharging passage is disposed outside the card turning passage, an end of the card turning passage away from the first card discharging passage is provided with a card pushing component, the second card discharging passage is disposed at a position opposite to the card pushing component outside the card turning passage, and the card turning component is driven by a card turning drive mechanism to open or close the first card discharging passage, when the card turning component opens the outlet of the first card discharging passage, a card feeding passage, a delivery passage, and the first card discharging passage are connected in sequence and a playing card is sent out from the first card discharging passage, when the card turning component opens the card turning passage and closes the outlet of the first card discharging passage, the card feeding passage, the delivery passage, the first card discharging passage, the card turning passage, and the second card discharging passage are connected in sequence, and the playing card is sent out from the second card discharging passage. wherein the card turning wheel is a driving wheel and is driven to be turned by a card turning motor, the first card discharge pressing wheel, the card turning pressing wheel, and the second card discharge pressing wheel are all driven wheels, the first card discharge pressing wheel and the card turning pressing wheel are in rolling contact with the card turning wheel, the second card discharge pressing wheel and the card turning pressing wheel are in rolling contact, a first card discharging passage is formed between the card turning wheel and the first card discharge pressing wheel, a card turning passage is formed between the card turning wheel and the card turning pressing wheel, a second card discharging passage is formed between the card turning pressing wheel and the second card discharge pressing wheel, the card turning wheel is installed on an inner side of the card turning passage and is located between the first card discharging passage and the second card discharging passage, the card turning passage extends along part of an arc circumference of the card turning wheel from one side of the card turning wheel close to the first card discharging passage to the other side of the card turning wheel away from the first card discharging passage, a card turning component configured to open or close an outlet of the first card discharging passage is disposed outside the card turning passage, an end of the card turning passage away from the first card discharging passage is provided with a card pushing component, the second card discharging passage is disposed at a position opposite to the card pushing component outside the card turning passage, and the card turning component is driven by a card turning drive mechanism to open or close the first card discharging passage, when the card turning component opens the outlet of the first card discharging passage, a card feeding passage, a delivery passage, and the first card discharging passage are connected in sequence and a playing card is sent out from the first card discharging passage, when the card turning component opens the card turning passage and closes the outlet of the first card discharging passage, the card feeding passage, the delivery passage, the first card discharging passage, the card turning passage, and the second card discharging passage are connected in sequence, and the playing card is sent out from the second card discharging passage.